We'll adapt the convention that we'll measure angle in a radian.
我们要适应它,以后都用弧度来表示角的大小
You can use this to express possession or a lack of possession of anything. Tangible or intangible.
你可以用它来表示你有或没有什么东西。有形与无形的事物都可以通用。
You can just talk about it in a simpler way.
你可以用这个简单的方式表示
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