? 2. Whose mine can have such a slope like a roller coaster?
3. Why did it fall from such a high place , you won't die if you fall, the deceleration of the water slide is used by wool, and the relative motion acceleration is all gravitation, okay?
4. The center of the earth? How can you withstand the air pressure of tens of thousands of Pa?
5. Is there air convection in the center of the earth? And dandelion as a wind medium?
6. When you got out of the water, you threw your bag and followed the bird into the hole. Will the backpack behind you teleport to recognize the owner?
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