She is not spooked when 18-wheeltractor-trailers roar past, but she keeps a death grip on the steering wheel.
当一辆18轮大货车呼啸而过时，她也不再畏惧，但是她总是死死地抓住方向盘。
2
Paper introduces a technique of the normal four-wheeltractor equipped with exhaust gas controlling device and designs a computer safety monitor system.
论述了在普通四轮拖拉机上加装废气控制装置的技术，设计了一种相配套的计算机安全监测系统。
3
The frame of mast derrick that is designed for hydraulic wheeltractor hoist adopt welding of armor plate, its section is oblong armor plate, and its material is HG60.