通过对国内外传动机械学的现状和存在问题以及发展趋势的分析，提出了我国传动机械学的研究目标，指出多学科领域的科技进步对它起着重要的推动作用。
This paper analyses the drive mechanisms present situation and questions as well as development trend domestic and oversea, and brings forward the drive mechanisms research objective of our country.
近年来，水下导航、海洋探测、水下目标定位以及水下通信等领域迅猛发展，这些领域常常使用水声信号作为信息传输的载体。
In recent years, the field such as underwater navigation ocean exploration locating of underwater object and underwater communication develop very fast.
当我阅读你们的作品时，我也会像这样具发展性地关切你们从前一份作业得到的进步以及对下一份作业的目标。
As I read your work, I will do so developmentally, considering your progress from the previous assignment and your goals for the next one.
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