Keep down! You mustn't let anyone see you.

　　蹲下！一定不要讓人看見你。

　　The computer system will be shut down over the weekend.

　　計算機(jī)系統(tǒng)周末關(guān)閉。

　　You must slow down or you'll make yourself ill.

　　你得松松勁，不然會累病的。

　　Let's get down to business.

　　咱們開始干正事吧。

　　Put the cases down there, please.

　　請把箱子擱在那邊。

　　His success was down to being in the right place at the right time.

　　他的成功之處就在于把握住了時機(jī)。