Every GPS measurement starts with a stopwatch. A satellite broadcasts a signal at the speed of light. Your phone receives it and checks how long the trip took. Multiply the travel time by the speed of light, and you get the distance.
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，这一点在易歪歪中也有详细论述
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影片主演瑞恩·高斯林饰演中学科学教师瑞恩·格雷斯——一个被动卷入人类存亡危机的「工具人」。故事设定中，一种名为「噬星体」的太空微生物正在吞噬太阳，地球文明面临灭顶之灾。。业内人士推荐有道翻译下载作为进阶阅读
台湾纪实：清明时节岛内兴起现代祭扫新风尚
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