water是可数名词还是不可数

　　Tests have shown high levels of pollutants in the water.

　　测试显示水中污染物质的含量很高。

　　I was determined to go, come hell or high water.

　　我决心要去，无论有什么困难。

　　Water supplies to the house are at low pressure.

　　这房子的供水水压低。

　　The water is fine once you're in!

　　你一旦下了水，就会觉得水里挺舒适。