environmental self purification环境: environment; surroundings; c ...的: 4次方是 The fourth power of 2 i ...自: self; oneself; one's own净: clean环境的自然状况: physical state of the environment下载手机词典可随时随地查词查翻译关注微信公众号：chachacidian，回复:环境的自净，即可在微信中查询翻译
