这个天文台拥有一台非常强大的望远镜。

The observatory has a very powerful ___telescope.

他整晚都在用他的新望远镜观测遥远的星系。

He spent the night observing distant galaxies through his new ___telescope.

通过望远镜，我们可以清晰地看到月球上的环形山。

We could see the craters on the moon clearly through the ___telescope.