求翻译：当今世界，人类正在向地下、海洋和宇宙开发。向地下开发可归结为：地下资源开发、地下能源开发和地下空间开发三个方面。地下空间的利用也正由“线”的利用向大断面、大距离的“空间”利用进展。是什么意思？

In today's world, human beings are to the underground, marine and space development. To the underground development can be attributed to: the development of underground resources, underground energy development and underground space development in three aspects. The use of underground space use by t

Today's world, human beings are underground to the sea, and space development. underground development to could be summed up as: underground resources, underground energy development and Underground Space Development 3. Underground Space is also being used by the "wire" to the big intersection, the

Now world, humanity to underground, sea and universe development.May sum up to the underground development is: The hidden resource development, the underground energy development and the underground space develop three aspects.Underground spatial use also by “line” use to big cross section, great di

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