A good glassblower could make a glass tube like this one in fifteen minutes.

一个好玻璃管工钟能制作一个这样玻璃管。

The Cryophorus consists of a glass tube with a bulb on each end containing water and water vapor.

此冰晶体形一细长玻璃管两端并各有一玻璃球,球里有水和水蒸气。