Definition: a thin layer of something on a surface Level: C2
水面上有一层薄薄的油膜。
There was a thin ___film of oil on the surface of the water.
做完饭后，灶台上留下了一层黏腻的油污。
After cooking, the hob was left with a sticky ___film of grease.
在寒冷的房间里，我的眼镜上凝结了一层水雾。
In the cold room, a ___film of condensation formed on my glasses.
