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Daphna Joel, who led the study, said her research found that while there are some gender-based similarities, many different types of brain can't always be distinguished by gender.

主持这项研究的达夫娜·乔尔说，研究发现，即使存在部分以性别为基础的相似点，许多不同类型的大脑也并非总是可以通过性别来区分。

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A new study challenges that belief, questioning whether brains really can be distinguished by gender.

一项新研究质疑了这一观点，对大脑是否真的可以按性别进行区分表示怀疑。

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Individuals within the various species of whales and dolphins can be distinguished by nicks or other markings on their fins and tails, or by pigmentation differences revealed by sharp photographs.

BBC: Saving the seas for marine mammals

In pre-Inca days, the valley was inhabited by two linguistically different groups, the Cabanas and the Collaguas, and their descendants can still be distinguished by their traditional hats: flat straw hats embroidered with a lace band for the Collaguas in the east and rounded felt hats intricately embroidered with cotton for the Cabanas in the west.

BBC: Exploring Peru��s epic Colca Canyon

On the other hand a practical reactor can be distinguished by the following characteristics: (1) It is being built now. (2) It is behind schedule. (3) It requires an immense amount of development on apparently trivial items. (4) It is very expensive. (5) It takes a long time to build because of its engineering development problems. (6) It is large. (7) It is heavy. (8) It is complicated.

ECONOMIST: The prospects