a plain girl的用法和样例：
- She is a plain girl in appearance.
- She was a plain girl with a square face and blunt features.
- A pretty girl usually receives more attentions than a plain girl.
- Answer with a plain "yes" if you agree with me.
- The picture may be seen to (its best) advantage against a plain wall.
- a homely child; several of the buildings were downright homely; a plain girl with a freckled face.
a plain girl的相关资料：