Youth boredom is the main culprit behind youth crime.
年轻人的无聊是青少年犯罪最大原因。
We can't decide when to leave.
我们不能决定什么时候离开。
Once we detected a planet, we would have to find a way of blotting out the light from its star, so that we would be able to 'see' the planet properly and analyze its atmosphere.