例如，研究人员上周说，他们已经设法从半公里远的一座电视发射台收集了足够了能量给一个小型温度传感器供电。
For example, the researchers last week said they had managed to gather enough energy from a TV station a half-kilometer away to power a small temperature sensor.
物理系统——一座建筑、一座桥梁、一辆汽车、一架飞行器、一艘轮船、或者一台计算机——存在于物理世界。
A physical system — a building, a bridge, a car, an aircraft, a ship, or a computer — exists in the physical world.
世界银行网站上播放过一段视频：一台起重机奋力铲平这些垃圾，清理出的垃圾堆成了一座小山。
A video on the World Bank website shows a crane scooping it clean, removing rubbish "the size of a small mountain".
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