每一档数字都是比前档减少一半的通孔大小。

Each aperture size (referred to as a stop) is marked with a corresponding number that represents half the light of the previous stop.

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要得到一个整洁的五角星可能需要一些试验，这取决于鞋子宽度和鞋孔大小。

It may take some experimentation to produce a pentagram with fairly even points, which will depend on the width of the shoe and the eyelet spacing.

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对照组中22例两侧横突孔大小正常且两侧对称(73%)，5例(17%)横突孔变小。

In control group, bilateral transverse foramen showed symmetrical and normal in size in 22 cases (73%), right transverse foramen smaller in 5 cases (17%).

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