Topspin
n. <网球>上旋
🗣️ 情景例句
Nobody knows how to do it.
没有人会打。
This dress is made of silk,isn't it?
这件衣服用丝绸做的，是吗？
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。