你是阳性的吗？
The best one I have heard is that an ion walks into a bar, and says to the barkeeper, 'I think I left an electron in here.' The barkeeper replies 'Are you positive?'我听过最棒的一个笑话是，一个离子走入一家酒吧，对老板说：“我好像落下一个电子在这”老板回答说：“你确定吗？（你是阳性的吗？）”
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