确实两种形式似乎都可以~ 但是tattoos肯定是可以作为复数形式的然后我记得我看过的美剧《friends》里第二季16集里有提到tattoo具体人物对话剧本如下：[Scene: Tattoo parlor. Phoebe and Rachel are deciding on tattoos.]场景：刺青商店客厅内 Phoebe and Rachel 正在对选择那种图案的刺青作决定PHOEBE: OK Rach, which, which lily? This lily or that lily?RACHEL: Well I. . .PHOEBE: I like this lily. It's more open, ya know, and that's like my mom. She had a more open, giving spirit. Ooh, Foghorn Leghorn, ooh.TATTOO ARTIST（负责为顾客刺青的老头）: Alright, blonde girl, you're in room two, not so blonde girl, you're with me.。。。。。（省略一部分）PHOEBE: Just, you know, long time ago. Well, when men used to tell women what to do - a lot. And then there was suffrage, which is a good thing but is sounds horrible. Do you want to get this tattoos?你想要这个刺青吗（最后一句）先举例这几句 后面还有但同样可以总结出下面一点：我列出的上面一共出现tattoo 四次以tattoos 形式出现的：deciding on tattoos，to get this tattoos?可见都是以单纯的名词形式出现（后面不加任何东西）以tattoo 形式出现：Tattoo parlor， TATTOO ARTIST这里都是与另一个名词一起组成一个新的集合名词希望对你有帮助~
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