Open cavity
[机] 外缩孔
🧩 词语组成解析
open
['opən]
adj. 敞开的，开着的;公开的，公共的;坦率的;有议论余地的;
vt.& vi. （打）开;开始;睁开;启动;
n. 户外，野外;空旷;公开;
vi. 使打开;展示，显现;
vt. 张开;开放;开张营业;为（建筑物）揭幕;
🗣️ 情景例句
It's extremely good of you to do this for me.
你帮我做了这件事，真是太好了。
She seems to have no principles at all when it is a question of making money.
一碰到挣钱的事，她就好像完全不顾自己的人格了。
who has beenworking or worrying about serious things for six days,
为严肃的公务操劳或烦恼了6天的