Fully automatic writing machine

An adult animation from 20 years ago, where a woman is bullied and a man does whatever it takes to g

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Speed bump!! Amazing machinery~

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How a Car Engine Works

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Leaf Cyclone

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a lovely family

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art is

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The wisdom of the working people—promise me you'll learn it!

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[Uncle Qiu Takes a Look] The video has been packaged—welcome to check it out!

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Yoga Ball Workout: Already asleep? Already trained? Did you say goodnight to me yet?

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How a vibrator works

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Technology changes life.

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A man's speed bump

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Can click "70" times per second👍The world's fastest Lego mechanical automatic mouse clicker❗️Mouse:

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Men’s Speed Bump: Mechanical 11.9

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Unboxing video!! The irresistible charm of machinery

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Principles of Turbocharging and Supercharging

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Force Excavator

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What's the meaning of "Zhongdeng" and "Laodeng"? Why are people referred to by various names online?

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The sixth finger of humans—human body structure actively expanding!

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Harmonic Drive Reducer

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