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

一玻璃工十五分钟能制作一这样玻璃。

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

此冰晶体形成器是一细长玻璃并各有一玻璃球,球里有水和水蒸气。