自净作用，自然净化
purification───n.净化；提纯；涤罪
purification tablet───净化片
purification garcia───提纯加西亚
natural───adj.自然的；物质的；天生的；不做作的；n.(Natural)人名；(西)纳图拉尔；n.自然的事情；白痴；本位音
purification system───净化系统
natural person───[法]自然人（区别于法人）
natural process───自然过程；天然过程；天然过程，自然过程
cicatrizante natural───自然愈合
natural amber───天然琥珀
Urine from the toilets is diverted to a reedbed for natural purification, and the faeces are turned into compost for the community’s forest.───尿从厕所引入苇地自然净化，粪便制成堆肥施在公共森林里。
purification of natural tocopherols from methyl esterified soybean oil deodorizer distillate was discussed.───以甲酯化的大豆油脱臭馏出物为原料，从中分离提纯天然生育酚。
Rain Court is an effective natural purification and disposal technologies, is also a bio-retention facilities.───雨庭是一种有效的雨水自然净化与处置技术，也是一种生物滞留设施。
eliminate pollution: hand with pure natural purification for the removal of raw materials, no two oppositely pollution.───杜绝污染：纯手工与天然净化炭为清除原料，无二次反向污染。