zài / wù lǐ xué / zhōng / shì jiè xiàn / shì / miáo shù / lì zǐ / zài / shí kōng / zhōng / de / lù jìng

在物理学中，世界线是描述粒子在时空中的路径。

In physics, a worldline is the path that describes a particle in spacetime.