多风信条件下，沙砾质戈壁与鸣沙山进行着往复式的能量交换及物质运动。
Under multi-wind directions, the energy exchanging and material transporting repeatedly happened between gravel gobi and the Mingsha Mountain.
介绍一种往复式金属零件凹表面打磨装置的组成部分、运动方案、基本结构和使用情况。
Has discussed a device that can be used to grinding dented surface of spare parts by back and forth movement. It has been introduced that the composition, the moving scheme, the structure and usage.
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