Quadtrees
四元樹
??? 情景例句
And right now, he needs a friend.
而且現在， 他需要一個朋友。
Better say nothing than nothing to the purpose.
與其說話不中肯，不如一言不發好。
Let me take a look at your shoulder. Where does it hurt?
讓我看看你的肩膀。哪里疼？