Poid
形心(曲线), 拟正弦线, 膺正弦线, 瞬心轨迹
🗣️ 情景例句
It's nothing.
这没什么。
How much does the elephant weight?
这个大象有多重？
Yes, London. The whole family's going for two months.
对，我们住在伦敦。我们全家打算住两个月。