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。
OBJECTIVE: To summarize and analyze progress and current status of cartilage tissue engineering scaffolds and its developing trend.
目的：总结和分析软骨组织工程支架材料的研究进展、现状及其发展趋势。
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