traction [ˈtrækʃn]

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n.牵引；附着摩擦力

the ability of a wheel or tyre to hold the ground without sliding

I'll show you how the traction is applied. 我会让你看如何做这种牵引。
She's injured her back and is in traction for a month. 她背部受伤，正在作一个月的牵引治疗。