那些自称皇室成员的骗子最终被警方逮捕了。

The impostors who claimed to be royal family members were finally arrested by the police.

impostors 是 impostor 的复数形式，impostor 来自拉丁语 impostor（"欺骗者"），由前缀 im-（表示"进入"或"在...上"）和词根 ponere（"放置"）组成，字面意思是"把虚假的东西放在别人身上"，引申为"冒充他人身份的骗子"。