8.5 cease doing/to do

cease to do　 長時(shí)間，甚至永遠(yuǎn)停做某事。
cease doing　 短時(shí)停止做某事，以后還會接著做。

　　That department has ceased to exist forever.
　　那個(gè)部門已不復(fù)存在。
　　The girls ceased chatting for a moment when their teacher passed by.
　　姑娘們在老師走過時(shí)，停了會聊天。