1、
The particles of sand rub, scratch and cut the rocks against which they are blown.
沙粒磨擦 、 刮削、割切着吹过的岩石.
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2、
Work in long course has three main categories: A. the scraping process.
在工作中耗时较长的过程主要有以下三种情况: A. 刮削过程.
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