回顾了流体传动与控制技术的历史进程，20世纪的主要成就，并展望了未来的发展前景。
The historical progress of fluid power transmission and control, the main achievements in 20th century are reviewed and its future is forecasted.
芳纶的发现是材料界的重要历史进程，芳纶作为一种新兴的高性能纤维进入了飞速发展时期。
The material is found aramid fibers, the important historical process as a new high fiber into rapid development period.
本论文共分为五部分：论文第一部分从美国纳斯达克证券市场的起源入手，分析了纳斯达克的历史进程及发展趋势；
There are total five parts in this thesis:In the first part, the author analyzed the history and the development trend of NASDAQ Securities Market through the emergence of NASDAQ security market;
人与自然的关系问题一直贯穿于人类发展的历史进程中。
Basically, the relationship between nature and humanity has been a problem running through the whole evolutionary history of mankind.
人与自然的关系问题一直贯穿于人类发展的历史进程中。
Basically, the relationship between nature and humanity has been a problem running through the whole evolutionary history of mankind.
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