It was the key to the door that they were searching for yesterday.

昨天他们寻找的是房门的钥匙。

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Note that we do not know a length of a key we are searching for.

请注意，我们不知道一个长度的关键，我们正在寻找。

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He is searching for the missing key.

他正在寻找失踪的钥匙。

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He is searching for the missing key.

他正在寻找失踪的钥匙。

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