a thing or two idiom
一些事情;些许知识，一星半点
some matters, facts, or information
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。
Why don't you ask Andrew about it? He knows a thing or two about (= has some knowledge of) computers. 这个问题为什么不问问安德鲁？他懂点计算机。
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。