As a language expert with a focus on English and Chinese communication, I'm well-versed in idiomatic expressions and cultural nuances. When someone says they're having a "bad hair day," it's an idiomatic expression that doesn't literally refer to the quality of one's hair but rather to an off day where things aren't going well.
"Having a bad hair day" is a lighthearted way to express that someone is experiencing a day filled with minor frustrations, annoyances, or mishaps. It's often used when someone wants to convey that they're not at their best or that they're dealing with more than the usual share of problems, but it's typically not a serious complaint.
Here's the translation:
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