Quadtrees
四元树
🗣️ 情景例句
And so are you, I think.
我想你也如此。
Skiing is such a difficult sport that it's more work than play.
滑雪是非常困难的运动，真所谓工作高于游戏呀。
Everybody knows him.His name is Percy Buttons.
大家都认识他，他叫珀西。巴顿斯。