Scientists have long thought that the structure of our brain is fixed.

科学家们长期认为人类大脑的结构是固定的。

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Is it a fixed structure?

是个固定结构吧？

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The structure of the safety valve can only be used for fixed devices.

这种结构的安全阀只能用于固定的设备上。

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The structure of the safety valve can only be used for fixed devices.

这种结构的安全阀只能用于固定的设备上。

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