It allows multiple keys, which raises the possibility of duplicate nodes in a group.

它允许多个键，提高了一个分组中重复节点的可能性。

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A skilled locksmith can duplicate many types of keys just by looking at the original.

一名老练的锁匠只要看一眼原物就可以复制出许多类型的钥匙。

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In one demonstration, the team cut duplicate keys after analysing images taken on a mobile phone.

在一次演示中，小组人员通过分析手机拍摄的照片对钥匙进行了复制。

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