Singletons
(singleton 的复数) n. 一个, 独生子, 独身
🗣️ 情景例句
It's complicated.
原因很复杂。
I don't know what time it is.
我不知道现在几点钟。
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。