来个数学笑话
前面几篇写了好几个关于水的笑话，都是属于化学类的。实际上笑话是不分学科的，这篇来一个数学笑话。
Q: Why are obtuse angles so depressed?
A: Because they’re never right.
翻译前先解释一下专业术语。obtuse angles的意思是钝角，就是大于90度小于180度的角。所以这个笑话翻译过来就是：
为什么钝角很沮丧呢？
因为它们从来都不对。
啥意思？为啥是钝角不right？要看懂这个笑话，得知道啥是right angel。这里的right可不是“正确”的意思，在数学里right angle的意思是直角。写到这里，这个笑话就看明白啦：钝角沮丧，因为它不是直角。
这个笑话就解释完了，笑过之后学到点东西才是最重要的。从这个笑话中，我们学到了这样几个词：obtuse angles的意思是钝角，right angle的意思是直角。最后，再来一点补充知识愉快的结束这个笑话。
锐角的英文是acute angle。
Reference
Posted from my blog with SteemPress : http://softmetal.vornix.blog/2019/01/08/%e6%9d%a5%e4%b8%aa%e6%95%b0%e5%ad%a6%e7%ac%91%e8%af%9d/
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