后来凹空心地球理论还主张。
Later the theory of concave hollow Earth was also advocated.
德国空心地面硬化钢，高碳钢镀铬刀片。
German hollow-ground hardened steel, high carbon chrome-plated blade.
科学界不托理论然而，许多支持者也推出了自己的空心地球的假说。
The scientific community does not shore up the theories however many supporters did roll out their hypothesis over the hollow earth.
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