How to say "一串钥匙" & "一把钥匙" in English please?

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和大家说的一样：
一把钥匙=a key
一串钥匙=a bunch of keys，你也可以说a set of keys，都是一串钥匙。

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一串钥匙 a bunch of keys
一把钥匙 a key

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"一  串  钥匙 = a bunch of keys "一  把  钥匙" = a key

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1. She fished out a bunch of keys from her handbag.  
    她从提包里掏出一串钥匙来。
2. As he picked up the envelope,a key fell out.
    他拾起信封时，一把钥匙掉了出来。

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一串钥匙 = Bunch of Keys
一把钥匙 = A Key