前挡玻璃上面呈现巩固的东西，如鸽子等鸟类的干枯大便时，也要防止直接运用雨刮硬刮。
The front of the glass above the consolidation of things, such as dove and other birds dry stool, but also to prevent the direct use of the wiper scraping.
除了平时运用时，前挡玻璃上假如积水较少，对雨刮进行空刮，简单加重雨刮的磨损，影响它的水平度。
In addition to the usual application, windshield wiper if less water, air blowing, simple increase wiper wear, affect its level.
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