pathline
pathline — 名詞
1. the curved path that a single particle of liquid or gas follows as it moves thro
軌跡；徑線
流體粒子在運動過程中實際經過的路徑
the curved path that a single particle of liquid or gas follows as it moves through space and time, often drawn or simulated in fluid dynamics to study how the flow behaves.
The engineer traced a pathline from the nozzle to see where each water particle went.
工程師從噴嘴開始追蹤一條徑線，觀察每個水粒子最終流向何處。
collocation: trace a pathline; traced [pathline] from [point] to [point]
In the simulation, each coloured dot follows its own pathline through the smoke plume.
在模擬中，每個彩色光點沿著自己的軌跡穿過煙霧。
collocation: follow(s) a pathline; pathline through [medium]
Karim traced pathlines on the weather map to track how the air parcel would travel.
Karim 在天氣圖上標出徑線，追蹤該空氣團如何移動。
Unlike a streamline, a pathline shows the route a single fluid particle takes over time.
與流線不同，徑線顯示的是單一流體粒子隨時間變化的路線。
- particle trajectory
broader term; used in mechanics and astronomy, not limited to fluids
用法筆記
Most often used in fluid dynamics and meteorology. Distinguish from streamline (instantaneous curve tangent to the velocity field) and streakline (positions of all particles that passed through a given point). A pathline is what a camera attached to the moving particle would record.