I stare at the train window marked with soft dust.

我注视着那沾有微尘的车窗。

youdao

Hitting a dust mote-sized particle would impart the same kinetic energy as slamming head on into a speeding freight train.

与尘埃级别的颗粒相撞，都可能得到与高速货车迎面相撞的能量。

youdao

Most are between those dust and foreign bodies, the train stuck between teeth.

大多数是轮齿间有灰尘、异物，使轮系齿间相互卡住。

youdao

We're in a burned-out area of Yellowstone National Park, miles from any road, surrounded by hundreds of acres of fire-blackened lodgepole pines, the hooves of our 17-animal pack train kicking up dust.

FORBES: Magazine Article

Matt Loxham, a medical biologist at Southampton University, collected minute dust particles of different sizes from at an underground train system in an unnamed European city.

BBC: Railway tracks