托福考试分类词汇学习：水资源

　　俗话说“条条大路通罗马”，背诵

　　distilled water 蒸馏水;

　　hard water 硬质水;

　　running water流水;

　　surface water 地表水;

　　waste water 污水;

　　soda water 汽水;

　　bubbly water (俚)香槟;

　　salt water 盐水;

　　fresh water 淡水;

　　tap water 自来水;

　　drinking water 饮用水