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人们专门弄了一个自然对数函数的底数 e,是为什么? - 知乎 自然常数 e 确实是一个奇妙的数字,这里的 e 并不仅仅是一个字母,它还代表数学中的一个 无理常数,约等于 2 718281828459 。 但为啥一个无理数却被人们称之为“ 自然常数 ”? 说到 e ,我们会很自然地想起另一个无理常数 π。
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英语音标 e 和 æ 的发音区别是什么?如何发出不同的音? 别人再给你写上几千字的描写,都不如你自己花上几分钟,上任何一个英语词典网站,打开 2 个网页,一个专门放 [ e ] 音单词,另一个网页专放 [ æ ] 音单词,对照着模仿几组带这 2 个音的 单音节 单词(简洁,便于区别、模仿),反复对照,模仿: dead -- dad bed