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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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To pin down the size of an orbital, we take a contour surface.
为束缚住轨道的大小,我们取一等值面。
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To pin down the size of an orbital, we take a contour surface.
为束缚住轨道的大小,我们取一等值面。
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