This has meant a disaster for health and social protection in the many countries where most labour is concentrated in the informal sector and the tax base is small.
在多数劳动力集中于非正式部门以及税基较小的许多国家，卫生和社会保护工作陷入困境。
Currently, it is the largest concentrated continuous base in the country that is equipped with the cutting-edge Israeli water-saving irrigation technologies.
是国内目前最大的采用以色列先进节水灌溉技术的集中连片基地。
Our attention was concentrated on metallic oxide solid base and composite solid base.
本文重点研究的是金属氧化物型固体碱和复合型固体碱。
Our attention was concentrated on metallic oxide solid base and composite solid base.
本文重点研究的是金属氧化物型固体碱和复合型固体碱。
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