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They do not always tell jokes, but they joke about the topic of discussion.
他们不经常讲笑话, 但他们会就讨论的话题开个玩笑.
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Some people cannot tell jokes well, they even make funny jokes seem sad.
有些人不会讲笑话，他们甚至把有趣的笑话讲得很悲伤。
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Teachers at New Oriental often tell some jokes to vitalize the class.
新东方老师总是讲些笑话，不会是使课堂重要吧？对了，是使课堂有生机。
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Mark likes to tell lame jokes, but at least his girlfriend pretends to laugh.
马克喜欢讲冷笑话，但起码他女朋友会假装笑一下。
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