Poid
形心(曲线), 拟正弦线, 膺正弦线, 瞬心轨迹
🗣️ 情景例句
I'm happy to meet you.
很高兴见到你。
I'll wear my blue dress.
我会穿我的兰色裙子。
So much is certain: that we would have doctors and preachers,
虽然我们还会有医生和牧师、