The system was down all morning.

　　系統(tǒng)整個(gè)上午都無(wú)法運(yùn)行。

　　The name has come down from the last century.

　　這名稱是從上個(gè)世紀(jì)流傳下來(lái)的。

　　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。