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How does the mine car pour out the coal? What is inside the cactus? Uncommon but very interesting cold knowledge
👆What is inside the lighthouse, the Fresnel lens.
👆The way the supermarket clears all the shelves.
👆How does the mine car pour out the minerals inside?
👆The appearance of the hydrant underground.
👆The internal structure of the credit card.
👆What is the cross section of the cactus?
👆The appearance of the interior of a car tire.
👆The internal structure of the lighter.
👆The cinema is removed from the seat and the screen.
👆The structure inside the escalator.