pocketknife

Now, use your pocketknife to touch the mica and see what will happen.

现在你用小刀去触及岩石中的云母,看看会产生什么现象.

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I got a really good pocketknife for $ 10.

我花十美元买了一把非常好的折叠刀.

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Steven killed the bird with his pocketknife.

史蒂文用随身带的小刀杀死了这只小鸟.

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