Relaxes the brake, the heavy item then voluntarily fast drops, reduces the return trip time, but this kind of hoisting jack structure is complex.

放松制动器，重物即可自行快速下降，缩短返程时间，但这种千斤顶构造较复杂。

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Watson and Francis Crick's description of DNA's double-helix structure, and in computing, with Jack Kilby's and Bob Noyce's independent inventions of the integrated circuit.

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