structure of bar system的用法和樣例：
例句
- This paper is directed against the reality problem that it is very difficult to measure the critical speed of the shaft system in a large scale hydrogenerator unit in operating.
針對大型水輪發(fā)電機組軸系臨界轉速難以實(shí)際測定的現實(shí)問(wèn)題，從理論分析的角度出發(fā)，抓住水力機組軸系結構的基本特點(diǎn)，提出采用較為簡(jiǎn)單的模擬結構，試驗研究水力機組軸系固有頻率及其振型特征。
