Poid
形心(曲线), 拟正弦线, 膺正弦线, 瞬心轨迹
🗣️ 情景例句
Mr. Malcolm Stewart, and it looks like a personal letter.
Malcolm Stewart先生收 ，而且看来是一封私人信件。
A swine over fat is the cause of his own bane.
猪死都因身过肥；象以齿焚。
Yes, I am. How did you guess?
是。你怎么猜到的？