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表示复数的s不是自由语素，必须附着于名词。
The plural 's' is not a free form, as it must always be attached to a noun.
《牛津词典》
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规则4：单字单词的语素自由度的最大和。
Rule 4: Largest sum of degree of morphemic freedom of one-character words.
youdao
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规则4：单字单词的语素自由度的最大和。
Rule 4: Largest sum of degree of morphemic freedom of one-character words.
youdao