self-purification of stream

美 [self ˌpjʊrɪfə'keɪʃ(ə)n əv striːm]英 [self ˌpjʊərɪfɪ'keɪʃ(ə)n ɒv striːm]
  • 网络河流自净
self-purification of streamself-purification of stream
  1. A study of self-purification mechanism of mountain stream to domestic sewage pollution

    关于山区溪流对生活污水自净机理的探讨