Because fault symptom space and fault space have complicated non-linear relations, the mathematical model of diagnosis system is difficult to build up.

由于故障征兆和故障类型之间常常存在复杂的非线性关系，使得诊断系统的数学模型很难获取。

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According to the characteristic of the large complex system, we built a fault diagnosis model in fault space to describe the relationship between fault sources and test set.

针对大型复杂系统的特点，在故障空间建立故障源—测试依赖关系模型。

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The cost overrun is partly their fault, for demanding more office space than was originally planned, and partly due to other factors, such as the refurbishment of an old building which has cost more than was expected.

ECONOMIST: The subtle art of getting round EU rules