go ahead和 keep up区别

意思和用法不一样
go ahead . .
开始,前进,领先
1. Food and fodder should go ahead of troops and horses.
兵马未动, 粮草先行。

2. Go ahead. We're all listening.
请讲，我们都在听。

3. B: Go ahead. I'm not using it.
请用吧。我现在没有要用。

keep up . .
保持,继续,维持,跟上(时代)

1. The enemy kept up their bombardment day and night.
敌军一直日夜不停地狂轰滥炸。

2. Please keep up your good work!
请大家继续支持,踊跃报告、贴相。

3. Keep up！Then you will succeed.
坚持！你一定能成功。