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

　　蹲下！一定不要讓人看見(jiàn)你。

　　The computer system will be shut down over the weekend.

　　計(jì)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(huì)累病的`。

　　Let's get down to business.

　　咱們開(kāi)始干正事吧。

　　Put the cases down there, please.

　　請(qǐng)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(shí)機(jī)。