中英释义：
双语例句
我之前提到过...,应该提到过...,我邀请你与我赌硬币正反面
I mentioned this before -I think I mentioned it before -if you say, I'm going to ask you to bet on a coin toss.
重点词汇
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硬币
coin; change; piece; specie; hard currency; metal currency; money which can be exchanged freely
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正反面
pros and cons; positive and negative