This paper deals with the influence of a humus layer of different thicknesses on the water quality environment by measuring and analyzing the concentration of nitrogen nutritional salts.

通过对不同厚度淤泥水中氮营养盐的测定和分析，初步研究了不同厚度淤泥对水族箱水质环境中氮营养盐的影响。

youdao

The water quality environment evaluation should consist of such three parts as the current situation evaluation, the dynamic evaluation and the pollution degree evaluation of water quality.

水质环境评价应该包括现状评价、动态评价和污染程度评价三项内容。

youdao

It can also help to purify the water quality, reduce pollution and improve environment.

荷花还可净化水质、减少污染、改善环境。

youdao

However, Beijing's environment bureau says water quality has "not been affected so far" by the illegal dump, Xinhua adds.

BBC: China media: No support for Abe

The degradation of water quality in surface and groundwater systems is further exacerbating water scarcity and negatively impacting our natural environment and the ecosystem services and goods that it provides, jeopardizing food security and livelihoods.

UNESCO: World Water Day 22 March 2010: Clean Water for a Healthy World

We welcomed increasing regional cooperation under the U.S.-Lower Mekong Initiative (LMI) in the areas of energy security, health, agriculture and food security, education, connectivity, environment and water, which significantly contributes to quality of life and capacity building among the Lower Mekong Basin countries, and supports ASEAN's aim of narrowing the development gap among its Member States and addressing the common challenges.

WHITEHOUSE: Joint Statement of the 4th ASEAN-U.S. Leaders' Meeting