内燃机配气凸轮型线分析，对于了解凸轮外廓线型特征、挺柱升程的运动规律，以及对于凸轮型线的设计改进都具有重要的意义。
The model and linear study on the exhaust cam of internal-combustion engine is of great importance to knowing about the linear features of cam's shell and the law of tappet movement.
这张卫星图片大约在当地时间早上7:45拍摄，这时太阳依然停留在地平线以下，从而我们可以看到，该地的地形外廓被投影到其高地的西侧。
This astronaut photograph was taken at approximately 7:45 a.m. local time, when the Sun was still fairly low above the horizon, leading to shadowing to the west of topographic high points.
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