Semicircumference
n. 半圆周
🗣️ 情景例句
He was dumb from birth.
他生下来就是哑巴。
To know one's self is true progress.
能有自知之明就是真正的进步。
One moment we were walking along the top of a hill and now we could see no more than about thirty metres ahead of us.
一时间我们还在山顶上行走，而现在30公尺开外的地方我们都看不清了。