a thing or two
a thing or twosome matters, facts, or information
一些事情;些许知识，一星半点
I'm having trouble paying attention - I have a thing or two on my mind.
我现在很难集中注意力——我心里有事。
She thinks she knows everything about raising children, but I could tell her a thing or two (= some information she does not know).
她觉得自己对于养育孩子样样精通，不过我倒可以让她见识一二。
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