Quadtrees
四元树
🗣️ 情景例句
Kids today have too much freedom, it's not like the old days.
现在的小孩太自由了，不像以前。
Mary gave birth to a baby last week.
玛丽上星期做妈妈了。
He opened the book and found a phrase.He read the phrase slowly.
他翻开书找到了一条短语。他缓慢地读着短语。