Normal discharge and nuisance spitting are accommodated by the use of a Watts air gap fitting and a fabricated indirectwaste line.
采用美国瓦茨气隙连接件和预制导向水管线，可能会伴随正常的排放和有害的喷溅。
2
Although treatment and disposal of health-care waste reduces risks, indirect health risks may occur through the release of toxic pollutants into the environment through treatment or disposal.
The sediment discharge of rivers with cultivated waste land of dry farm, population density are indirect proportion, it with forest cover degree, per capita output of grain are inverse proportion.