The backing comprises a first surface and a second surface.
所述背衬包括第一表面和第二表面。
Select the next cell in the design surface (the first row and second column).
在设计图面中选择下一个单元格（第一行、第二列）。
Then, particles of another type were brought to the surface of the second drop.
然后，另一种类型的粒子引入到第二个液滴表面。
Second, pay attention to surface weathering degree.
第二，注意表面风化程度。
In the second part, we mainly research and improve the moving surface fitting.
第二部分是移动曲面拟合法的研究和改进。
A second concave part is formed on the bottom surface of the base plate.
该基板的该底表面形成一第二凹陷部。
The second annular surface defines, at least in part, a second brake chamber.
第二环形表面至少部分地限定第二制动室。
The second function of platelets is to provide a surface that promotes blood clotting.
血小板的第二种功能是为血液凝固提供活性表面。
The brake pin includes a first annular surface and a second annular surface.
该制动销包括第一环形表面和第二环形表面。
The brake pin includes a first annular surface and a second annular surface.
该制动销包括第一环形表面和第二环形表面。
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