释文：改水是指改良饮用水的水质。普遍认为地方病高发区的病因与水土因素有关，因此采用多种方法对居民用水的水质进行分析，根据水质的物理化学性质，有目的地增加或去除某些物质成分，使饮用水的水质得到改良。
... 改速信号 slow speed signal 改说 reword 改水 improve water quality; recreational water ...
基于6个网页-相关网页
最新更改水平 latest change level
防病改水 Disease control to change water
改水降氟 improving water to reduce fluoride ; defluoridation to improve water
农业水价改革 pricing reforms for water used in agriculture
改善地下水水质 improve groundwater quality
防氟改水 Anti-fluoride water
降氟改水 water defluorination
改良水井 [建] Improved Well
结果与改水前比较，水源的卫生防护状况有很大改善；
Results The sanitary protection of water sources was greatly strengthened after the water improvement project.
目的了解河南省降氟改水打井工程水氟含量和工程使用情况。
Objective To understand water fluoride concentration and application of the fluoride lowering well digging projects in Henan Province.
今后改水降氟措施的主要方向应推广改用低氟水源，加强管理；
Using lower fluoride water source is the recommended method for water defluoridation and the management should be strengthened.
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