通过对周衍柏编写的《理论力学教程》第二版中的弧坐标中质点加速度表达式的推导作些改进。
In the book Course of Theorical Mechanics by Yanbai Zhou there are some mistakes about the expression of acceleration in arc coordinates, this paper has corrected them.
介绍利用屏幕截取技术制作人降作业炮点四周环境坐标示意图的方法。
In this article , we introduce how to use the technology of screen capture to draw coordinate sketch-map for the site of weather modification.
噢，瞧见他手上拿的纸了吗?那是我一周锻炼计划的坐标方格。
Oh, and see the paper in his hand with my exercise grid for the week?
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