此外，我们考量到未来科技，我们从地球形成开始。
Also, we think about future technologies. We start with the beginning of Earth.
从受力角度看凸形管帽中从半球形管帽。
From the perspective of convex pipe stress in the cap from hemispherical tube cap.
从受力角度看凸形管帽中从半球形管帽。
From the perspective of convex pipe stress in the cap from hemispherical tube cap.
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