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英语翻译The key tolerance is the [0.007in/ft (0.59 mm/m) paralle

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英语翻译
The key tolerance is the [0.007in/ft (0.59 mm/m) parallelism of the top surface of the head adapters to the head mating surface along with the [0.0005 in (0.01 mm)] perpendicularity of the top surface to the penetration centerline.
句子的主干是The key tolerance is the parallelism of the top surface to the head mating surface to the centerline.这样理解应该对的吧,剩下的问题是那几个数字怎么插进去,才能好理解呢?
应该是这样的:
The key tolerance[0.007in/ft (0.59 mm/m)] is the parallelism of the top surface of the head adapters to the head mating surface along with the perpendicularity[0.0005 in (0.01 mm)] of the top surface to the penetration centerline.
这里:
公差(key tolerance)=0.007in/ft (0.59 mm/m)
垂直度(perpendicularity)=0.0005 in (0.01 mm)