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。

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