The thesis makes experiment and theory analysis on ability of the exhaust braking when a bus goesdownhill.
对客车下坡行驶时排气制动的能力进行试验和理论研究。
2
After ten kilometers up the mountain, then walk 10 km over the smooth road, and finally 10 km of downhill, so it goes on every day.
上山十公里之后,接着走十公里较平坦的路,最后是十公里的下坡路,如此这般每天重复。
3
Most rivers start as streams of water in the mountains. (1) The small streams flow downhill and join other streams to form a river that goes on to the sea or a lake.