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

好的玻璃管工十五钟能制作这样的玻璃管。

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

此冰晶体形成器是细长玻璃管两并各有玻璃球,球里有水和水蒸气。