中石化最大的骄傲就是，其在涪陵的所有生产工具和设备均为国产。

Sinopec is most proud of the fact that all of its production tools and equipment in Fuling are made in China.

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不可控变量在流程中可能包含人为干涉和不同的工作团队、生产批量、每周工作天数、生产工具生产设备甚至是同一个生产工具的使用人数所产生的差异同种设备的数量。

Uncontrolled variables thatgo into this process may include human intervention and differences in work teams, production lots, days of the week, machines or even heads on the same machine.

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