①mean doing sth 意味着做某事
eg：Missing the train means waiting for an hour.
错过这趟火车,意味着再等一个小时.
②mean to do sth意欲做某事（=want to do sth）
③ ——You are joking!你是开玩笑吧!
——No,I mean it.不,我是认真的.
④What do you mean by……?
eg：What do you mean by saying that?
⑤have meaning to sb 对某人来说有重大意义.
⑥by all means “一定”、“无论如何”、“用一切手段”.