Semiarc
n. 半弧
🗣️ 情景例句
so she had to take an earlier flight today.
所以她不得不在今天搭早一班的班机。
What we are ignorant of is immense.
我们不知道的东西多得不可胜数。
I am not sure such data does exist.
我不确定是否有这样的资料存在。