As he picked up the envelope, a key dropped out.
他拣起信封时，一把钥匙掉了出来。
He picked up a chicken breast, enjoyed eating it and then accidentally dropped it.
他拿了块鸡胸，开心的吃起来但是不小心掉了。
He picked up a small stone and dropped it into the pitcher.
他捡起一块小石头，把它放进水罐里。
He picked up a small stone and dropped it into the pitcher.
他捡起一块小石头，把它放进水罐里。
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