指出，按照不同的分类标准，转向轮摆振研究的内容也不同。
It is pointed out that con tents of researching on shimmy are different according to different classification criteria.
前轮摆振是指汽车在平坦的路面上直线行驶时，转向轮以一定的幅度和频率绕主销持续振动的现象。
Front wheel shimmy is the phenomenon that steering wheels vibrate around king-pin axis with a certain amplitude and frequency when the vehicle travels in a straight road.
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