In physics, the world line of an object is the unique path of that object as it travels through 4-dimensional spacetime. The concept of "world line" is distinguished from the concept of "orbit" or "trajectory" (such as an orbit in space or a trajectory of a truck on a road map) by the time dimension, and typically encompasses a large area of spacetime wherein perceptually straight paths are recalculated to show their (relatively) more absolute position states ? to reveal the nature of special relativity or gravitational interactions.
例句与用法
1.
Its world line is tipped at the angle corresponding to the speed of light . 它的世界线倾斜的角度与光速相对应。
2.
Audiences all over the world lined up at motion picture theaters to hear her incredible voice . 世界各地的观众都排着队买票去欣赏她那惊人的歌喉。
3.
We were smooching and holding hands . " each night , dozens of people from around the world line up at the old wooden booth , with no computer in sight , and buy their tickets to the latest escape 现在，每天晚上，来自世界各地的人们在sun pictures老式的票房前排起了长队，这里采用了古老的人工售票的方式而不是电脑售票，大家争先购买最近上映的电影的票子。
4.
Each armed with hk 3 , 000 in spending money , 18 teams of shoppers from around the world line up with hktb executive director clara chong centre to begin their shopping spree in hong kong island s lan kwai fong 香港旅游发展局旅发局总干事臧明华女士中发号施令， 18队来自全球的参赛者由港岛消闲热点兰桂坊出发，利用大会提供的3 , 000港元，展开疯狂购物行动。
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