圆脸的英文是 round face。这个词的来源可能来自于拉丁语"rotundus"，意思是"圆的"或"丰满的"。

例句：

She has a round face with big, bright eyes.

她有一张圆脸，眼睛又大又明亮。

His round face and cheerful smile make him look like a friendly person.

他那圆圆的脸蛋和愉快的笑容让他看起来很友好。