8.5 cease doing/to do
cease to do长时间,甚至永远停做某事。
cease doing短时停止做某事,以后还会接着做。
That department has ceased to exist forever.那个部门已不复存在。
The girls ceased chatting for a moment when their teacher passed by.姑娘们在老师走过时,停了会聊天。