The earth has that much material, gravity is great, this is also our feet on the ground can not fly out space cause.
地球有那堋多的物质，引力就很大了，这也是我们站在地面不会飞出太空的原因。
Extra gravity is an effective method of producing homogeneous crystal material.
超重力是制备无偏析晶体材料的有效手段之一。
Extra gravity is an effective method of producing homogeneous crystal material.
超重力是制备无偏析晶体材料的有效手段之一。
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