With my increasing investigation in the water system of cities, I think I arrived at a small conclusion recently, that is, people need nature.

随着我对城市水系的考察增多，我想最近我对这个问题有了个小答案，那就是人们需要自然界。

youdao

Particles of polypropene, with densities approaching that of water were used as tracer in the water system for the investigation of the flow characteristics.

在观察水在管内的流动特性试验中，用聚丙烯颗粒作为示踪粒子，其密度与水非常相近。

youdao

Special case for investigation works out the water treatment scheme, adopt the special field compound water treatment preparation and perfect technical service system.

专案制定水处理方案，采用专业的复合水处理制剂及完善的技术服务体系。

youdao

Furthermore, the participants of seminar gave practical suggestions for improvement of scientific-research and educational potential of investigation and usage of underground water with an adoption of information and communication technologies, including geographical information system and present-day simulation methods and forecasting approach.

UNESCO: OFFICE IN TASHKENT