This paper describes the status and developing trend of organic silicon industry at home and abroad.
简述国内外有机硅行业的现状及发展趋势。
The paper summarizes the current status and developing trend of mechanical structure of railway signal equipment;
全面概述了铁路信号设备机械结构的现状及发展趋势；
The latest developments of these three fields are described, from which the current status and developing trend of vacuum metrology can be found.
本文描述了这三个方面的最新进展，从中可看出真空计量学的现状与发展趋势。
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