有人建议，洗澡应该是“对水的尝试”至少一小时，让母亲判断其有效性。
It has been suggested that the bath be used in a "trial of water" for at least one hour, allowing the mother to judge its effectiveness.
工程实践证明了该矿突水防治方案的可行性和有效性。
The practice shows that the mine's control plan of the water irruption is feasible and effective.
研究结果表明：高聚物不仅能提高土壤的持水力和增加土壤水对植物的有效性，而且还能抑制土壤水的蒸发。
The result shows that the high polymers VAM and PHM can not only enhance the water retention ability and the available water content, but also prevent the evaporation from the surface soil.
除草剂在水-土壤系统中的降解、吸附和迁移等环境行为是支配其在土壤环境中的生物有效性和持留性的重要因素。
The degradation, adsorption and mobility in water-soil system of herbicide are dominated factors to affect the bio-efficiency and lasting in the soil environment.
在水权交易中，第三方回流问题的存在使得水权交换市场的有效性受到了质疑。
In water right trade, the validity of water market is queried, due to the return-flows problem.
在水权交易中，第三方回流问题的存在使得水权交换市场的有效性受到了质疑。
In water right trade, the validity of water market is queried, due to the return-flows problem.
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