Regarding athletes ability of breaking through and attacking as the research object, this passage USES the methods watching the video, using logic to analyse etc.
以运动员突破攻击能力为研究对象，运用录像观察、状态比较、逻辑分析等方法。
The introduction mainly explains the aim, the methods, the research range and the relating works regarding this thesis.
引言主要阐明本文的研究范围、与本文相关的研究成果以及本文的研究方法和目的。
Secondly, there is an introduction of some practical algorithms of time-domain damage identification methods have been done, regarding bridge damage identification as the research target.
其次，以桥梁损伤识别为研究目标，引入了时域法的几个实用算法。
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