Springs and rivers that drain into lakes carry dissolved nitrates and phosphates.流入湖中的泉水和河水携带了溶于水的硝酸盐和磷酸盐。Springs and rivers that drain into lakes carry dissolved nitrates and phosphates.流进湖里的泉水和河水携带溶解的硝酸盐和磷酸盐。Most fertilizers contain nitrogen and phosphates.大多数化肥都含有氮和磷酸盐。