But when is below the freezing temperature of water, how could there be a liquid layer?

但低于水的冰点温度时，怎么可能有液体层呢？

And he figured that the liquid surface layers became solid when they weren’t touching air anymore.

他认为，当液体表面层不再接触空气时，它们会变成固体。

And in Marseilles with 20 degree weather and sunny skies, there was definitely a liquid layer to be found.

在马赛，气温为 20 度，天空晴朗，肯定存在液体层。

A really hot extruder nozzle squeezes out liquid plastic layer by layer right where the computer program tells it to.

一个非常热的挤出机喷嘴在计算机程序指挥下一层一层地挤出液态塑料。