Sphericity
n. 球状, 球形
🗣️ 情景例句
I'm going to miss her
我会想念她
I'm catching the 11:00 train.
我准备赶11点火车。
only of metal, which wears away by friction.
而是由金属组成，而金属可以随着磨擦而磨损殆尽。