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3.2.13. m, n, ŋ
m 和 n 处于音节开头时，没有人会觉得困难。尤其是 m…… 因为它也许是人类学会说的第一个辅音；于此同时，ɑ 永远是人类学会的第一个元音，所以大家都用 mɑ 称呼自己的母亲。
When m and n are at the beginning of a syllable, no one finds it challenging. Especially m, since it might be the first consonant humans learn to utter. At the same time, ɑ is always the first vowel humans learn, which is why mɑ is a universal sound for mother.
ŋ 处于其它元音之后对所有人来说也同样不构成困难，因为英文中最常用的不过是 ɪŋ 而已……
Similarly, everyone finds it easy to pronounce ŋ after other vowels. This isn't surprising, given that ɪŋ is the most commonly used sounds in English.
麻烦在于 m 处于音节末尾的时候。很多人会不由自主地额外加上一个 ʊ 的音，这是一个嘴唇的多余动作产生的结果。比如，把 room /ruːm/ 读成 /ruːmʊ/。
The tricky part comes when m is at the end of a syllable. A lot of people have an involuntary habit of adding an extra ʊ sound, which results from an unnecessary lips' movement. For instance, they might pronounce room as /ruːmʊ/, instead of /ruːm/.