When is the best time to ring New York?
什么时间给纽约打电话最好？
It was a difficult situation, when you think about it.
仔细想来，当时处境是很困难的。
When they set out they were well prepared.
他们出发时有很充分的准备。
Text me when you're on your way.
路上给我发短信吧。
When do the new regulations come into force?
新规章什么时候开始执行？