a head scratcher 費解之事
英文釋義 (FORMAL) Something that confuses; a puzzler.
例句 EXAMPLE: My friend's sudden departure from the
company at which he worked happily for ten years is
a real head scratcher, and I can't understand it.
我的朋友突然離開他快樂工作了十年的公司實在讓人費解,我想不明白。