Underfilling
不[未充]满, 底层填料
🗣️ 情景例句
He emphasized the importance of being honest.
他强调诚实的重要性。
Learning is better than house and land.
学问是一生的财富。
he realizes its volume, as the space that the shape displaces in the air.
他能意识到物体的体积，那就是它的形状在空气中所占的空间。