不可数，dew，意思是露水，例如：

1、The grass was wet with early morning dew.清晨的露水使得青草湿漉漉的。

2、If it were not for the vapour in the air， there would be no dew.如果空气中没有水气，就没有露水。

3、The dew gathered on the leaves.露水在叶子上凝结。