Underfilling
不[未充]满, 底层填料
🗣️ 情景例句
I'd like to introduce you to some of my friends.
我想介绍你认识一些我的朋友。
I ought to make a phone call.
我应该打个电话。
What colour are you going to paint it?
你打算把它漆成什么颜色？