为了解决复杂性，而产生了结构化的语言，例如Pascal和c，生成了提供状态空间的有用分割的状态变量的层次结构。
Coping with complexity led to structured languages such as Pascal and c, which created hierarchical structures of state variables that provided a useful partitioning of the state space.
结构健康监测中，对于大型、复杂的结构，要想获得反映整个结构健康状态的数据参数，就必须在结构的各个重要部位安装多个不同类型的传感器。
Many different types sensors were fixed in each important spots of a large-scale, complex structure, in order to acquire the data reflecting the health state of the structure.
柴油机是一种典型的往复式动力机械，结构复杂决定了对其进行状态监测与故障诊断的困难性。
However, diesel engine is a typical reciprocating machine, its monitoring and diagnosis are very difficult because of its complex structure.
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