P-2：parade one's knowledge 卖弄学问
A:Mark is parading his knowledge again.
A:马克又在卖弄学问了。
B:Yeah! He's very good at showing off his knowledge.
B：是啊，他总是善于炫耀。
A:A well-learned person never does that.
A:真正有学问的人从不那样做。
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