| 1. | A typical lens has a focal length(f)of 625 mm .
常见镜头的焦距（f）为625毫米。
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| 2. | The glass level should be held within a range of 1/2 mm .
玻璃液面的波动范围应控制在0.5毫米内。
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| 3. | These increments were mixed and looked into the 5. 56 mm cartridge case .
将各种药粒进行混和，装在556毫米的弹壳中。
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| 4. | Initially 24 mm holes were drilled at the crack tips to arrest propagation .
最初，在裂纹尖端钻24mm的孔以阻止其扩展。
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| 5. | If the diameter of the pupil is 6 mm the eye is able to separate 120 seconds of arc .
如果瞳孔直径为6毫米，人眼可分辨120弧秒。
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| 6. | The machine is capable of processing 500 mm square plates very uniformly .
这种机器可用来冲洗500毫米见方的底片，并得到很均匀的效果。
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| 7. | Sem stages are now available that can handle wafers 125 mm and larger in diameter .
现今已有能处理125mm和更大直径的片子的SEM样品台。
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| 8. | All existing web cracks were arrested by drilling 19 mm holes at the ends of the cracks .
所有已存在的腹板裂纹都在裂纹端部钻19mm的孔止裂。
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| 9. | The eupatheostat consisted of a vertical cylinder 550 mm high by 190 mm diameter .
拟人器是由一个直径为190mm，高度为550mm的垂直圆柱体构成。
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| 10. | The center wire is usually of tungsten or stainless steel and is about 0. 1 mm in diameter .
中心丝通常是钨丝或不锈钢丝，直径约为01毫米。
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