重要
used
/juːst/📚 1842 81 1四级六级考研中考If something used to be done or used to be the case, it was done regularly in the past or was the case in the past. 过去惯常
adjective [原级]用过的，旧的；二手的；习惯于，适应于
A used object is dirty or spoiled because it has been used, and usually needs to be thrown away or washed.
用过的
verb [vt. 及物动词]使用，利用；消耗；说，写，使用（词语或语言）（use 的过去式和过去分词）
If you are used to something, you are familiar with it because you have done it or experienced it many times before.
习惯于
单词造句: