Anthony saw the black steel edge of the snowplow blade hit the young child under the chin, driving his head back and scraping over his face.

安东尼看到车辕黑色金属刃的边缘击中了那孩子的下巴，并把他的头硬撞到后面并直接刮过了他的脸。

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A study is made on the working Angle in scraping process, practical Calculations are taken up to the Angle of working edge, rake Angle and back Angle. Some patterns of such change are found out.

本文对刮削过程中工作角度问题进行了探讨，并对工作刃倾角、工作前角和工作后角进行了具体计算，得到了一些变化规律。

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