Proper combination of simple extraction and circulation extraction can increase yield and extract concentration simultaneously on the basis of assurance efficiency.

将简单提取和循环提取适当组合能够在保证效率的基础上使收率和提取液浓度有较大提高。

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Using catalyst is an available and economic method to improve the quality of small-molecule combustible gas, increase the biomass utilization efficiency and decrease the tar yield.

使用催化剂是一种可以提高小分子可燃气体品位、提高生物质利用效率、减少焦油产生的经济可行的办法。

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Water is the main factor influencing crop yield in dryland areas, and the efficient way to increase crop yield is to improve utilization efficiency of precipitation.

水分是限制旱地作物产量最主要的因素，提高自然降水利用效率是增加旱地作物产量的有效途径。

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