许多文献认为，弱介质中电场解用时域谐波叠加形式分析时，无因果关系可循。
It has been reported in many literatures that electric field solution is not cau sal when formed by a superposition of time harmonic waves in an attenuation medium.
运动性内源自由基与细胞适应性调节机制、运动损伤的因果关系、疲劳发生的机制等方面研究目前仍无突破性进展。
The studies of free radical during exercise on effects of the mechanisms of cell adaptive regulation and exercise-induced fatigue and the causality of sports injury are still no obvious development.
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