蒸汽经过塑料导管传到试管过程中，接触到冰冷的玻璃后开始液化。

The steam passes along the plastic tube to the test tube, where it condenses on contact ith the ice-cooled glass.

youdao

蒸汽经过塑料导管传到试管过程中，接触到冰冷的玻璃后开始液化。

The steam passes along the plastic tube to the test tube, where it condenses on contact ith the ice-cooled glass.

youdao