除非在这里修个水库，才能解决灌溉问题。
Only when a reservoir is built here can we solve our irrigation problem.
当你写作时如果有家人或朋友在场，那就提前约法三章，告诉他们除非紧急情况否则不要打扰你。
If you have family or friends in the house when you write, establish some ground rules early on and tell them to disturb you only in an emergency.
网络上存在着很多的危险以及各种各样的个性特点——除非你能确定什么时候他们准备好了。
There are many dangers online and many variables with each individual personality - only you can decide when they are ready.
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