Pick the Direct Selection Tool and click on the shape path. Click the vertical point and drag it down while holding the Shift key until it reaches the same level with the horizontal axis.

用直接选取工具单击这个图形的路径，单击垂直点然后按住shif t键往下拉直到如图所示状态。现在看起来不错了，但是还是比较简陋。

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The clamping means, cutter selection, tool path planning and cutting parameters determination using three-axis machine for aluminum windshield pieces were studied.

研究了风栅铝片三轴铣削加工中装夹方法、刀具选择、走刀规划以及切削参数确定方法；

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Finally, the selection of underground power house axis and the lining design scheme for the pressure tunnel are discussed based on the in-situ stress.

最后从地应力角度，讨论地下厂房的轴线选择和高压隧洞衬砌设计方案。

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