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随着人口的不断增加,城市、工交建设占地越来越多,我们的地球越来越挤,生存空间越来越狭窄,有朝一日我们也许会被“挤”出地球。为解决地球生存空间日益缩小的问题,科学家们进行了大胆的设想,提出并试验了许多方案。 重返地下,再度穴居,是人类近期选择的出路。我们的祖先早期就是在洞穴中生存,钻木取火地生存下来的,而今我们又要重返地下。所不同的是现今科学技术发达了,向地下发展也比我们的祖先拥有了主动权。日
With the continuous increase of the population, the construction of cities and industries will increase. As our planet becomes more and more crowded and the living space becomes narrower and narrower, we may one day be squeezed out of the earth. In order to solve the ever-shrinking problem of the planet’s living space, scientists have made bold ideas and proposed and tested many solutions. Returning to the underground and burrowing again is the way out for mankind’s recent choice. Our early ancestors lived in caves and survived by drilling and fire. Now we must return to the ground. What is different is that today’s science and technology are developed, and development in the underground also has the initiative over our ancestors. day