挠头

The complexity of this math problem is giving me a serious head-scratch.
这道数学题目的复杂性让我感到非常困惑。
I'm completely stumped by her sudden decision; it's really a head-scratcher.
我完全被她突然的决定搞糊涂了，这真是令人费解。
Why he would choose that career path is a real head-scratcher for all of us.
他为什么会选择那样的职业道路对我们所有人来说都是一个谜。
That explanation for the phenomenon is quite a head-scratcher; I need more details to understand it.
对这个现象的解释很是让人摸不着头脑；我需要更多的细节才能理解。
This computer software bug has had our IT team scratching their heads for days.
这个计算机软件漏洞让我们的IT团队困惑了好几天。
His choice of outfit for the formal event was a total head-scratcher; it didn't fit the dress code at all.
他在正式场合所穿的衣服简直是让人百思不得其解，一点不符合着装规定。
The judge's ruling in this case was such a head-scratcher that even legal experts were left perplexed.
法官在这个案件中的裁决如此令人困惑，连法律专家都感到不解。
It's a head-scratcher how they managed to turn a profit with such a flawed business model.
真是令人难以理解他们是如何用这样一个有缺陷的商业模式实现盈利的。
Her reaction to the news was a real head-scratcher – instead of being upset, she seemed delighted.
她对这条新闻的反应真让人迷惑——她没有表现出沮丧，反而显得很高兴。
The fact that the team decided to bench their star player for the crucial game is a total head-scratcher.
队伍在关键比赛中决定把主力球员放在替补席上，这件事真是令人费解。