Robots can be used for many tasks which are considered too dangerous for people to do.
机器人能完成许多对人类来说是很危险的任务。
We can't see it very well.
我们不能看得很清楚。
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.