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frivolous
例子
His frivolous attitude towards his studies often landed him in trouble with his teachers.
She's often seen as frivolous, but beneath the facade, she's quite shrewd.
Despite appearing frivolous at first glance, he's actually quite thoughtful and insightful.
While she may seem frivolous on the surface, she's actually a dedicated and hardworking professional.
Throwing away money on frivolous expenses can lead to financial difficulties.
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