We have chosen the best place to observe the annular eclipse of the sun.
我选定了一个观测日环食的最佳地点。
A test rig of annular seal properties is built.
建成了一套周隙密封性能实验台。
A wheel rubber layer is inlaid in the annular steel plate.
环形钢板上镶一层车轮橡胶。
It is found that there is a secondary flow on the annular cross section.
结果表明：环形截面上存在二次流。
The first annular surface defines, at least in part, a first brake chamber.
第一环形表面至少部分地限定第一制动室。
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 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 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。
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