Inalterable
a. 不能变更的
🗣️ 情景例句
I'll get you to help serve later.
等一会我会叫你帮忙分菜。
Teacher. He is teaching.
老师。正在教书。
Since that time, various types of hovercraft have appeared and taken up regular service.
从那以后，各种各样的气垫船出现了，并开始了定期航行服务。