Public-key algorithms, on the other hand, are asymmetrical, using different keys, a public key, and a secret key, for encryption and decryption.

公开钥匙算法则是不对称的，采用不同的密钥，一个公开的钥匙和一个秘密的钥匙，用于加密和解密。

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But if the disc detects that the player has been modified to record the movie, or it is using stolen keys from a different player, the disc won't play.

但如果碟片侦测到播放机被改动成能录制，或者用的是从其他播放机偷来的密钥，碟片内容就放不出来。

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Using keys, you can combine different lights with materials to experiment with the effects.

按其中的键可以将不同的颜色与材质综合，感受不同的效果。

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One study looked at how consumers use their phones: They wanted to multitask but had a tough time using the same keys for different things.

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