在它的逻辑视界中，自然界就是那个在实践活动中生成而在符合人们需要的形式上存在着的现实自然。

The view of Practice is real logical start point of Marx by which explain the relationship between human and nature.

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长期以来，人们普遍认为该书在形式上整齐划一，而在内容上是驳杂多变、极难驾驭。

For a long time, it is generally agreed that the form is unified, but the content is heterogeneous and changeable, extremely difficult to control.

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