您要找的是不是:
water purification
water-borne infection ; water-borne tramiion ; water-borne transmission
level of bilateral trade cooperation
to promote all-round improvements to China’s open economy ; comprehensively improve the level of the open economy
经水(jīng shuǐ) (1) [menstruous blood]∶中医指月经。 (2) [rivers rise in mountain and flow to the sea]∶河水的干流。