traction

traction
noun
[mass noun]

the action of drawing or pulling a thing over a surface, especially a road or track
（尤指在道路、轨道上）拖拉，牵引
a primitive vehicle used in animal traction.
用畜力拖拉的原始车辆。
■motive power provided for such movement, especially on a railway
（尤指在铁路上的）牵引力，拉力
the changeover to diesel and electric traction.
向柴油和电力牵引的大转变。
■locomotives collectively
机车总称
(Medicine)the application of a sustained pull on a limb or muscle, especially in order to maintain the position of a fractured bone or to correct a deformity
(医)（尤指治疗骨折及畸形的）牵引（术）
his leg is in traction.
他的腿正在作牵引治疗。
the grip of a tyre on a road or a wheel on a rail
（汽车轮胎、火车车轮的）附着摩擦力
his car hit a patch of ice and lost traction.
他的车开到了一片冰上，打起滑来了。

tractional
adjective
语源

late Middle English (denoting contraction, such as that of a muscle): from French, or from medieval Latin traction-(n-), from Latin trahere 'draw, pull'. Current senses date from the early 19th cent

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