We'd know it for any of the coordinate planes.
对于任意坐标平面，都应该知道怎么做。
Difference between the angles of edge projections and the angles of the intersections of surfaces and coordinate planes are raised in this paper.
同时区分了刀刃在坐标平面上的投影角和刀面相对坐标平面的倾斜角，并用实例计算说明这两种角度有时差值较大。
And, in terms of a graph, they correspond to slicing by a plane that's parallel to one of the coordinate planes, so that we either keep x constant, or keep y constant.
从图像上看，它们对应于,用平行于坐标轴的平面横截图像得到的，过程中保持x或y恒定。
I am using dS rather than dA because I still want to think of dA as maybe the area in one of the coordinate planes like the one we had in double integrals. You will see later where this comes in.
这里使用dS而不是dA，因为我习惯把dA看成是，坐标平面中的面积元，就像在二重积分中所做的那样，待会大家会了解。
To measure the flame lift-off length and evaluate its asymmetry, an evaluating coordinate system is built which contains two planes and one Angle.
然后建立了一个评价火焰浮起长度及其不对称性的评价平面系，该评价平面系包括两个平面和一个角度。
To measure the flame lift-off length and evaluate its asymmetry, an evaluating coordinate system is built which contains two planes and one Angle.
然后建立了一个评价火焰浮起长度及其不对称性的评价平面系，该评价平面系包括两个平面和一个角度。
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