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scientific and technological invention - scientific and technological invention Free Videos
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Various magnet combination pen, can write, can draw a circle, a multi-functional brush
Life
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01:28
When foreigners invent triangle tire bicycles, the principle is exquisite and they are too happy to ride.
Life
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00:53
The shining zebra crossing is said to have saved countless lives!
Life
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01:30
What happens when a rocket ejector is installed in a driver's car?
Life
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02:15
Unsatisfied with the compatibility of mountain bikes, it has to be transformed into a spring-driven bicycle.
Life
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01:18
What do you cut bread with? Kitchen knife? Take a look at this novel kitchen knife made with a saw
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