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Life A trolley saves effort, and one person can carry a kilogram of goods without any effort upstairs or downstairs.
2019-05-20 15:01:39 ·
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A trolley saves effort, and one person can carry a kilogram of goods. It's easy to go upstairs and downstairs. Good news for the courier.
Tags：Labor-saving trolley, handling jacks, scientific and technological inventions
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