A very small lens aperture is employed to correct spherical aberration , but this severely limits the final resolution.

可以用一个非常小的透镜孔阑来校正球差，但这会严重地影响最终鉴别率。

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Therefore the part could be 5.997 to 6.003 in. and still be the correct size. These are known as the limits. The difference between upper and lower limits is called the tolerance.

因此，生产出的零件的尺寸可能是5.997至6.003英寸，但这仍然属于正常尺寸范畴，此为限度，上限和下限之间的差额称为公差。

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Therefore the part could be 5.997 to 6.003 in. and still be the correct size. These are known as the limits. The difference between upper and lower limits is called the tolerance.

因此，生产出的零件的尺寸可能是5.997至6.003英寸，但这仍然属于正常尺寸范畴，此为限度，上限和下限之间的差额称为公差。

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