轮距

tread (on tire) / gauge

tread (the distance between the two front – or two rear – wheels of a vehicle)

wheel / disk / ring / steamship / to take turns / to rotate / by turn / classifier for big round objects: disk, or recurring events: round, turn

wheel; disk; ring / steamship / to take turns; to rotate / classifier for big round objects: disk, or recurring events: round, turn

at a distance of / distance / to be apart