a number of 一些 （可数）（复数）

你归纳的完全正确,我再补充一下。简明英汉词典 a number of 可数 许多的A number of new products have been successfully trial-produced。许多新产品已试制成功。A great number of problems have arisen。出现了许多问题。A large number of people were present。很多人出席了。the number of 什么东西的数量 可数如：the number of buses汽车的数量the amount of 可数1,什么东西的意思（要旨） 如：The amount of his remarks is that 。。。他的话总的意思是。。。2,什么东西的数量如：What is the amount of this?这总共是多少?简明英汉词典 an amount of 不可数adj。许多 。“It’s difficult when you’re used to being really fit and agile,having an enormous amount of energy and strength and a really flat stomach。“你平时苗条灵活,精力充沛,这下子可难了。