Poid
形心(曲线), 拟正弦线, 膺正弦线, 瞬心轨迹
🗣️ 情景例句
Thanks, Grandpa.
谢谢你 ，爷爷。
I used to take a walk in the early morning.
我过去常一大早出去散步。
Oh, we must find them. What are they wearing?
哦，我们必须找到她们。她们穿什么衣服？