双眼皮的正确说法应该是double eyelids，单眼皮就是single eyelids。除了特指一个眼皮的情况外，眼皮后面一定都要记得加“s”，否则你就变成独眼怪啦。

【例句】
She has a pair of big eyes and deep double eyelids.
她有一双大大的眼睛，深深的双眼皮。

Kelly is fabulous with her unique single-eyelids.
凯丽独特的单眼皮让她魅力四射。