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。
Put the cases down there, please.
请把箱子搁在那边。
His success was down to being in the right place at the right time.
他的成功之处就在于把握住了时机。