A lot of research work has been done on the improvement of small wheel tractor traction performance in recent years.
近几十年来，国内外许多学者、专家对如何提高拖拉机的牵引附着性能作了大量的研究，取得了较好的效果。
The way to reduce the noise of the engine of the small four-wheel tractor is pointed out.
为小四轮拖拉机发动机的降噪指明了方向。
Therefore, the adjustment of small four-wheel tractor and trailer brakes simultaneously host should be to adjust the main trailer.
因此，调整小四轮拖拉机主机与挂车刹车同步时，应以调整挂车为主。
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