We need to improve the driveability side of the engine and also the mechanical traction of the car.
我们需要改进引擎的操控性能和赛车的机械牵引力。
Ring chain is applicable to coal mine scraper conveyor, plough, drum shearer and other mechanical traction chain, etc.
圆环链适用于煤矿刮板输送机、刨煤机、 滚筒采煤机及其它机械牵引链等。
The cause of this disease is not clear now. Generally speaking, chronic accumulated injuries, mechanical traction and stimulation are believed to be the major causes.
本病的病因目前尚未十分明了，一般认为，膝关节慢性积累性损伤，机械性牵拉和刺激是主要原因。
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