mantle的t要发生浊化嘛？

stand中的t要浊化吗？~

是的

在音标/s/后面有/t/要浊化读成/d/的情况有两种：
1 在单音节单词中，/s/在音标的首位即第一个音标就是/s/
2 在多音节单词中，/s/前面有重读或者次重读符号
满足以上任意一种就浊化

不“浊化”，这个所谓的“浊化”其实是个错误概念。因为中文没有浊音，所以中国人学习外语的时候，也不会发浊音。这就是我们听着老外说话比较低沉的原因。“浊化”实际指的是两个“送气清音”放在一起的时候，第二个变成“不送气清音”。常见的就是sp sk st 。

mantle的t不发生浊化。
在美国英语中，/t/位于两个元音之间，重读音节之后时，要发成浊辅音/d/，这个现象在下面一篇文章里讲述。
I'm really excited about today's show about the t sound being replaced by a d sound by native speakers in the United States. I've been waiting and waiting to talk about the strange things the t sound does, but it was pretty far down the list of episodes I thought were important. I'm deciding to do it now because there have been two recent forum posts about this topic, and both of the topics were started by Brazilians. However, this issue is important for lots of languages, not just Portuguese. This issue was first brought to my attention when I was teaching a corporate class earlier this year and two Spanish speakers came up to me on a break and asked my why they were both hearing an r sound in the middle of the word water. "An r sound?" I asked. "Yes," they answered. "In the middle of the word?" "Yes," they answered. This seemed very strange to me, so I asked them what their native language was, and they both said it was Spanish. I asked them to say the word, which they both pronounced "water." I asked them if they heard an r sound when they said the word, and they both said, "no". Then I pronounced the word "water" two different acceptable ways, and asked them in which way they heard an r sound. I had my answer as to why they were hearing an r sound in the middle of the word water, and it all has to do with what linguists call an alveolar tap, and what I call a "quick d sound".
If you've been listening to these podcasts for a while, and have heard the podcasts about the r sound, I warned you all of tapping your r's. (tapped r sound). That tapped r sound is the same sound Americans make when we substitute a quick d sound for the t sound, and is a common sound in both Spanish and Portuguese, as well as numerous other languages. Since most non-native speakers don't substitute the quick d sound for the t sound, your r sound and t sound are perceived as very different sounds, which they are. Now, that was a long story about why Spanish and Portuguese speakers are hearing an r sound when they think they should be hearing a t sound or a d sound. Today I want to teach you about when Americans use a quick d sound in place of a t sound. And I have a forum post about the r issue that I hope you'll go to and tell me if you do or don't hear an r sound when I say a quick d sound. I'm still curious about it, and I just think it's pretty neat.
So, when do Americans substitute a quick d sound for the t sound. This is the beginning of some somewhat complicated formulas I'm going to give you. The quick d sound isn't the only thing we say instead of the t sound, we have two other options as well, which I'm going to get to in the next few weeks.
For today, when do Americans substitute a quick d sound for a t sound?
Americans substitute a d sound for a t sound (are you ready?) when the t sound follows a vowel or an r sound, and comes before a vowel, r sound, schwa+r, or l sound. Think about it like this, vowels, r's and l's will mess up a t sound. Here, I'll repeat the rule again. Americans substitute a d sound for a t sound when the t sound follows a vowel or an r sound, and comes before a vowel, r sound, schwa+r, or l sound.
Let's look at our example of the word water. The t in the middle of that word is following an aw sound, and comes before a schwa+r, so American will substitute a quick d sound for the t sound. I'll say the word with a proper t sound, then with a quick d sound.

water (t)
water (d)

I'll say them both again.

proper t sound: water
quick d sound: water

Notice that I said a "proper t sound". The dictionary shows a t sound for this word, and it is absolutely okay to continue to say a t sound in that word. However, it is not the way most native-English speaking Americans will say it. In fact, Americans who always say a proper t sound will sound a little odd to other native speakers. Only when the word is being stressed for emphasis, is it more likely that the t sound will be said properly.
Listen to a few more words that are generally pronounced with a quick d sound in place of a t sound.

turtle
bottom
native
battery
artificial

Here's another thing about this rule. It isn't just when the t is in the middle of a word that it can change to a d sound. Marcelo, when he first mentioned the r sound issue in the forums, gave three great examples of the same thing happening when the t is the last sound of a word. He gave the examples: "it_is" "without_it", and "that_again". All of those t's fall between vowels because the next word in the examples begins with a vowel sound. This will cause the t sound to shift to a quick d sound, even when it spans across words.
I have students in Seattle who have lived here from as little as a few weeks to as long as many decades. I will mention that this is a subtle aspect of English that seems like people who live here longer do pick up intuitively. But everyone mentions that the quick d sound substitution caused trouble with listening comprehension when they first moved here. During these podcasts, I try not to speak in an overly formal fashion because I want you to hear more natural speech, and I intentionally say the t sound as the majority of other speakers do.
Unfortunately, every rule of English has an exception, and the t as d rule has one as well. If the t is the first sound of a stressed syllable, it will remain a t sound. I've seen a lot of pronunciation material that says that a double t in the middle of a word will be pronounced as a d sound. Well, it isn't true if the double t begins a stressed syllable. An example it the word attach. The stressed syllable is the "tach" part of the word, so the t sound stays as a t sound, attach. I wouldn't say addach. Can you hear the difference? Attach, addach.
Here are some more words that seem as if they may have the t pronounced as a quick d sound, but don't, because the t is the first sound of a stressed syllable. Listen carefully to hear the t sound in the following words.

determine
italic
interpret
attendance

Oh, this episode had a lot of explanations and a lot of rules. Here is the rule again for when the letter t will get pronounced as a quick d sound: Americans substitute a d sound for a t sound when the t sound follows a vowel or an r sound, and comes before a vowel, r sound, schwa+r, or l sound.
Let's practice. Repeat these words after me. All of them have the t replaced by a quick d sound.

turtle
bottom
native
battery
artificial

Now, please go to the forums and let me know what language you speak, and tell me if you hear an r sound in these words or not. A lot of languages have an alveolar tap, and so I wonder how many of you hear it as an r sound.
希望我能帮助你解疑释惑。

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