核心问题
a great amount of (amounts of) 与 a great quantity of (quantities of) 有无区别?
词典解答
在正式英语里，a great amount of (amounts of)后面只能跟不可数名词，而 a great quantity of (quantities of)后面除可跟不可数名词之外，还可跟可数名词。这两个结构之后跟不可数名词的例句，分别见 amount 与 quantity。下面补充几个 a great quantity of (quantities of)后面跟可数名词的例句（参见 quantity/quantities）：
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There are only a small quantity of flowers left in the garden. 花园里只剩少量的鲜花了。
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Use equal quantities of nuts and raisins in the cake. (Thorndike) 蛋糕里放等量的花生和葡萄干。
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The man died very suddenly from drinking a small amount of rum after eating a large quantity of bananas. 这个人吃了许多香蕉,然后喝了点朗姆酒,突然就死了。