Understanding a single biological unit-the heart, the lungs-is hard enough.

光是一个生理结构(心、肺)的理解就够难了。

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Without such registration, no unit or individual shall export dual-use biological agents and related equipment and technologies.

未经登记，任何单位或者个人不得经营生物两用品及相关设备和技术出口。

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The first step toward understanding neural nets is to abstract from the biological neuron, and to focus on its character as a threshold logic unit (TLU).

理解神经网络的第一步是从对抽象生物神经开始，并把重点放在 阈值逻辑单元（TLU）这一特征上。

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