Why doesn't the belt fall off the convex pulley?

Again? This has been a rumor for 10 years...

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Today's decompression video: Skilled Worker Series~

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[SCIENCE]Use animation to show the mechanism of a ring box

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What does the "strikeout dance" refer to?

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The "thousand-legged snake" in Shennongjia was discovered, "if separated it becomes an insect, but w

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[Exploring the Mystery] Some boys’ “femininity” may be caused by genes!

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Unzip video of the irresistible mechanical series~

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Wear women's clothes once, and you will know how many perverts there are abroad

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