Poid
形心(曲线), 拟正弦线, 膺正弦线, 瞬心轨迹
🗣️ 情景例句
Well, I suppose that might work.
嗯，想这样或许可以奏效。
When the cat's away the mice will play.
猫儿不在，老鼠造反。
Litter baskets have been placed under the trees, but people still throw their rubbish everywhere.
树下都已设置了废物筐，但是人们仍到处扔垃圾。