规定
我可以给你解释一下 因为前面的week 是名词,名词当然复数时要用复数形式
而后面的20 -minute walk 等类似的词语中,20 -minute 整体都是做定语的,也就是相当于形容词的词性,起修饰作用,就不加s 了.
为什么two-week holiday前有a时week后不加s,而20 -minute walk前有a时,mintue后
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