In other words, you don't say that it's a cylindrical glass object.

换句话说，你不会说它是一个圆柱形玻璃物体。

Lathes make wheels, or, more precisely, they make cylindrical objects.

【precisely】车床可以车削轮子，更确切地说，可以车削圆柱形物体。

A " telescope" is a long, what we would call cylindrical, round object that you look through.

“望远镜” 是一个长的， 我们称之为圆柱形的圆形物体，你可以透过它观察。