If you travel by air,you will (earn) (gain) time. 选什么？为什么？

gain和earn区别~

earn
vt.
1. 赚得,挣得
How much do you earn a week?
你一周赚多少钱?
2. 博得,赢得
3. 使得到,使赢得[O1]
His achievements earned him respect and admiration.
他的成就赢得人们的尊敬和仰慕。

gain
vt.
1. 得到;获得,赢得(战争、诉讼等)
Our army gained the battle.
我们的军队赢得了那场战役。
He gained possession of more land.
他拥有了更多的土地。
2. 使得到[O1]
He had gained himself a reputation for unfairness.
他使自己得到了一个不公正的名声。
3. 增加,增添
I gained five pounds in a week.
我一个星期体重增加了五磅。
4. 到达
We gained our destination before dark.
我们天黑之前到达了目的地。
5. (钟、表等)快
My watch gains five minutes a day.
我的表一天快五分钟。
vi.
1. 获利,赚钱;得益[(+by/from)]
We all gained from the experience.
我们都从这次经验中获益。
2. 取得进展;得到改善;增进健康
The singer is gaining in popularity.
这歌手越来越受到人们的欢迎。
3. (钟、表等)走快
n.
1. 获得;增加;获利[U][C]
The baby had a gain of half a pound.
婴儿的体重增加了半磅。
He served the public wholeheartedly, regardless of his personal gain or loss.
他全心全意为公众服务,从不计较个人得失。
2. 获得物;收益,利润[C]
He escaped to South America with his ill-gotten gains.
他带着不义之财逃往南美。

个人觉得3.0-3.5
另外 怎么一眼看去都是you？……不应该出现太多的吧

这里都可以用的。首先gain time是固定用法，但是earn也有节省时间的意思。除了这种特殊情况外，两者一般不互用

gain,你到gain time应该是个固定用法吧，有个english saying"gain time ,gain life"

earn

earn比gain多一层"节省"的意思.
gain"获得得到"

gain
接省时间,不能用赚取时间

gain

earn money, gain+ something

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