vast amount of 还是vast amounts of?

问题描述:

vast amount of 还是vast amounts of?
providing relief after the disaster necessitated the mobilization of vast amounts of food,medical supply and people.
amount有必要加复数么?另外这个medical supply 是否改成supplies?为什么啊

medical supply 改成supplies 作为补给品为复数
amounts of=an amount of