物理学家牛顿发现，所有物质都有相互的吸引力，叫作万有引力或重力。
Physicists Newtonian found, all matter is a mutual attraction, called gravity or gravity.
主动式医疗器材：指以电能或其它能源，非直接由人员或重力产生以发挥其功能者。
Active medical device: any medical device relying for its functioning on a source of electrical energy or any source of power other than that directly generated by the human Body or gravity.
我们甚至还可以想方设法把磁力或重力等力量应用到机器动力上而无需使用其它任何方法。
We may even find ways of applying forces such as magnetism or gravity for driving machinery without using any other means.
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