牵引运输

推土机为自行式铲土运输机械，它依靠行走机械提供动力，推动整机进行工作，是典型的牵引型运输机械。

Bulldozer is a self-propelled transport machinery , it relies on travelling mechanism to promote the machine to work , is typical of traction transport machine .

大力发展电力牵引提高铁路运输能力

To enhance the railway transportation capacity by promoting electric traction

水平井牵引器具有运输方便、操作简单、输送位置准确等优点，大大降低了井下作业成本。

Easy to transport , the simple operation and getting location accurate are the good quality of the Mule Downhole Tractor . It reduces the logging cost .

随着我国铁路电气化线路建设的发展及列车运行速度的提高，电力机车、电力动车组逐步成为列车的主要牵引动力和运输工具。

With the development of electric railway construction and improvement of its speed in our country , electric locomotive and EMU has rapidly been the major traction and transportation instrument .

充分发挥牵引动力在铁路运输中的作用用加权多项式回归进行球状模型变差图的最优拟合

Making the Best Use of Traction Motive Power in Railway Transportation ON THE BEST FITTING OF THE SPHERICAL MODEL VARIOGRAM WITH THE WEIGHTED POLYNOMIAL REGRESSION

半挂牵引车由于其运输量大、成本低廉、高效经济等优点，逐渐引起了各方面的关注和重视。

Because of the big freight volume , low-cost and high efficient , the Tractor Semi-trailer have gradually causing concern and attention in all aspects .