condensation

In the morning, you can see condensation on the outside of the cold windows.

(Chinese) 早晨，你可以看到冷窗户外面有凝结的水珠。

Proper ventilation is necessary to prevent condensation and mold growth inside the house.

(Chinese) 适当的通风对于防止房屋内部的水汽凝结和霉菌生长是必要的。