a little water意为很少水，一点水
little watter意为几乎没有水，在程度上比 a little 更少
这是用法little / a little
Little remains to be done about it. (作主语)
A little remains to be done.
Please give me a little. (作宾语)
He knows a little of everything.
There is very / but little time left. (作定语)
Don’t worry; you still have a little time.
1． little修饰不可数名词，表示“量”。
2． little含否定意义(反义词：much)；a little含肯定意义(反义词：none)。
3． 在非正式英语中，一般很少用little，常用not much, only a little来代替，如：
We haven’t got much money / time.
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