However, the diameter of the filling groove (34) is smaller than the diameter (d) of the ball, thereby the ball (25) does not fall off.

然而，填充槽(34)比滚珠直径(D)略小，使得滚珠(25)不会脱落。

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Pitch diameter (d) is the diameter of the pitch circle.

节圆直径(D)：节圆直径是节圆所在圆的直径。

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Depending on the relationship between height (H) and diameter (D) of dominant trees, it takes the height of the dominant achieved at base diameter as the index of site quality estimation.

试图从优势木树高与胸径的相关关系入手，以优势木在标准胸径时所达到的树高作为评估地位质量的指标。

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