Peritrochoid
外摆线圆
🗣️ 情景例句
I know you don't understand but you will just have to accept my opinion this time.
我知道，你或许不能理解，但这次你必须接受我的意见。
To be of use in the world is the only way to be happy.
为善最乐。
Jim, is this your football sock?
这是你的足球袜吗？