Poid
形心(曲线), 拟正弦线, 膺正弦线, 瞬心轨迹
🗣️ 情景例句
Why don't you write to me, Robbie,
你为什么不给我写信呢 ，Robbie，
Hello, it's a pleasure to meet you all.
你们好，很高兴见到大家。
No, not all of them.
不，没办法全部。