可可英语每日一句口语：

What is a man's first duty? The answer is brief:to be himself!一个人的首要职责是做什么？很简单：做自己！

【知识点讲解】

duty n.义务；职责；责任；税；关税

例句：I feel it my duty to speak frankly to you.我觉得我有义务要坦白地对你说。