Many people raised eyebrows when they know he is a boy.
eyebrow==(noun), fringe of hair above the eye. 眉毛, 眼睫毛;
raised eyebrow==express surprise, doubt,etc.揚起眉毛(表示驚訝,懷疑等);
Many people raised eyebrows when they know he is a boy.
當他們知道他是男孩子的時候,感覺到非常驚訝。
參考: According to ”The Advanced Learner's Dictionary of Current English with Chinese Translation” published by Hongkong Oxford University Press in 1975