existing problems and development trend 存在的问题及发展趋势
In this paper, the present situation, problems and development trend of colour concentrates production in China were introduced and some Suggestions were proposed.
本文介绍了我国色母粒的生产现状、存在的问题及今后的发展趋势，并提出了一些建议。
On this basis, the study analyzes research problems and development trend of perceptual anticipation, which can provide a theoretical basis for the in-depth study of this area.
在此基础上剖析知觉预测研究的不足及未来发展趋势，为该领域的深入研究提供理论依据。
The principle, procedure and data processing of the analysis method of gas concentration based on optics are described. The problems and development trend of this method are analyzed.
对基于光学的气体浓度分析方法的原理、方法及数据处理进行了阐述，分析了气体浓度光学分析方法的存在问题及发展趋势。
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