平凡的珍妮（不漂亮的女人或女孩）
a woman or girl who is not attractive
If she'd been a plain Jane, she wouldn't have had all the attention. 如果她象平凡的珍妮，她就不会成为关注的焦点。
His wife was a plain Jane with tightly curled hair and a long chin.
It's the story of a plain Jane who transforms into a glamorous beauty.
She is a resolute plain Jane who doesn't wear make-up or style her hair.
Nobody will give a plain Jane like me a second thought.
See also: plain adjective (NOT BEAUTIFUL)