telescope flint glass

例句：

1. 1. The astronomer used a telescope to observethe stars.
   天文学家使用望远镜观察星星。
2. 2.The astronaut was able to usea telescope to see the planet Mars.
   宇航员能够使用望远镜看到火星。
3. 3. The childrenwere fascinated by the sightsthey could see through the telescope.
   孩子们对通过望远镜能看到的景色感到着迷。