[文法] 以下句子可以不加s嗎?

[unto (That's OK)]

空中英語教室99/2月 page.33

Though not free,special services include treadmills,pet paintings,
hair salons and more.

改成下列ok嗎?意思差在那?
Though not free,special services include treadmill,pet painting,
hair salon and more.

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