the action of pulling something along a surface; the power that is used for doing this 牵引；拖拉；牵引力；拉力 a way of treating a broken bone in your body that involves using special equipment to pull the bone gradually back into its correct place 牵引（使体内断骨复位的疗法） the force that stops something, for example the wheels of a vehicle, from sliding on the ground （车轮等对地面的）附着摩擦力 the extent to which an idea, a product, etc. becomes popular or gains support 牵引力： 创意，产品等变得流行或获得支持的程度The president's message is gaining traction among undecided voters. 总统的信息在犹豫不决的选民中越来越受欢迎。
Word Originlate Middle English (denoting contraction, such as that of a muscle): from French, or from medieval Latin tractio(n-), from Latin trahere ‘draw, pull’. Current senses date from the early 19th cent.