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可可英語每日一句口語：
Sometimes, you have to be your own hero. Because sometimes, the people you can't live without can live without you. 有時候你必須做自己的英雄，因為有時那些你離不開的人可以離開你。
【知識點講解】
have to 不得不，只好；只得；必須；不得已
例句：You have to pay your outstanding bill before joining the scheme.在參加該項目之前必須結清余賬。
