This line visits the AST tree, starting at the compilation unit (the top-most node), and queries for a list of all method declarations.
这一行访问ast树，起步于编辑单元(最顶层的节点)，并且查询所有的方法声明。
The time history of water hammer in pipeline in the condition of unit emergency load dump is calculated by characteristic line method.
在水电站机组丢弃负荷情况下，利用特征线法计算管道内的水击荷载时间历程。
The unit pressure in backward extruding hollow billet has been calculated by the slip line method and the upper bound method.
本文对空心件反挤的单位挤压力，采用滑移线法和上限法进行了计算。
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