Quadtrees
四元树
🗣️ 情景例句
I'd like to order a hamburger and fries.
来个汉堡包和薯条吧。
Let me direct that question to the manager.
让我直接问经理好了。
I have just heard from my sister, Mary.
我刚收到我妹妹玛丽的一封信。