動(dòng)詞 keep down:

1. place a limit on the number of
   同義詞：number
2. put down by force or intimidation
   同義詞：repress, quash, subdue, subjugate, reduce
3. manage not to throw up

1. Keep down! You mustn't let anybody see you.
   蹲下! 一定不要讓人看見(jiàn)你。
2. Keep down of you'll be hit by shell fragments.
   別起來(lái)，否則你會(huì)被彈片擊中的。
3. The people have been kept down for years by a brutal regime.
   人民多年遭受野蠻制度壓迫。
4. Keep your head down!
   不要抬頭！