Poid
形心(曲线), 拟正弦线, 膺正弦线, 瞬心轨迹
🗣️ 情景例句
I can't believe it!
我简直不敢相信！
Beg from beggers and you'll never be rich.
向乞丐乞讨，永远发不了财。
After a few minutes she started to cry again. Listen to me, I said.
几分钟后她又哭了起来。“听我的呀，”我说。