The system was down all morning.

　　系統(tǒng)整個上午都無法運行。

　　The name has come down from the last century.

　　這名稱是從上個世紀(jì)流傳下來的。

　　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。