抗議其後演變為民主運動，成為1997年香港主權移交中國以來，對政府最嚴峻的挑戰。
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With additional reporting from Mark Poynting, Jonah Fisher, Miho Tanaka and Tom Ingham.，这一点在爱思助手下载最新版本中也有详细论述
Some of the components he designs are like "variable springs", he explains – motion-controlling parts able to go into reverse and soak up some impact from the ground below, say. "It can dynamically absorb load as you need it to."