Underfilling
不[未充]满, 底层填料
🗣️ 情景例句
Next time you are in town, drop me a line.
下次你在城里的时候给我写信吧。
Custom makes all things easy.
若照习惯办，万事皆不难。
Then he spoke slowly, but I could not understand him.
于是他说得慢了，可我还是听不懂。