The system was down all morning.
系统整个上午都无法运行。
The name has come down from the last century.
这名称是从上个世纪流传下来的。
Keep down! You mustn't let anyone see you.
蹲下！一定不要让人看见你。
The computer system will be shut down over the weekend.
计算机系统周末关闭。
You must slow down or you'll make yourself ill.
你得松松劲，不然会累病的。
Let's get down to business.
咱们开始干正事吧。