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.
故事发生在1993年3月的一个夜晚。苏梅克夫妇到加利福尼亚圣迭戈附近的一座天文台去观测天体，直到黎明。
The story dated back to one night in March, 1993, when mr.and mrs.shoemakers went to an observatory near San Diego, California to observe heavenly bodies till dawn.
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