这是一个暗语，万一您丢失了您的存折，我们可以用它来确切地辨别您的身份，或者由于某种需要，用以准确地辨认身份。
It's a code word we use to positively identify you in case you lose your passbook or there is some other need for positive identification.
如果辨别正确，会被要求再试一次。 值得注意的是，这次会在之前的声音中加入噪音，使元音更加难以辨认，本周的《新科学家》报道。
If they got it right, they were asked to try again, only this time, noise was added to make the sound harder to recognise, this week’s New Scientist reports.
“看起来，它们可以辨认出不同形状的鱼鳍，这意味着他们能辨别出不同的鱼类。”他这么告诉BBC新闻频道。
"They seem to be able to discriminiate between different shapes, which might even mean they discriminate between different species of fish," he told BBC News.
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