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1、（1）quantities of：修饰不可数名词时，谓语用复数。

2、（2）a quantity of：修饰不可数名词时，谓语用单数。

3、（1）相同点：① 两者都可以修饰可数名词或不可数名词。

4、②它们的意思都是“大量”（2）类似：a lot of 和lots of（3）例句：①The quantities of each element type will be handy tools for estimating the total effort required.每种元素类型的数量对于估计所需的总工作量将是便利的工具。

5、②The government, after this time, did issue contracts to manufacturing companies to produce new quantities of the virus.在此事件之后,美国政府,和病毒生产企业签了,生产一些病毒的合同。

6、③And the solution to this equation looks like this where it is written in terms of a quantity called a wavefunction.这个方程的解法是,看起来像是写成数学符号就是,波函数。

7、④This kind of migration is tedious and has a high cost in terms of money and time when there is a quantity of data involved.当涉及到大量数据的时候，这种类型的移植操作单调冗长而且会花费大量的资金和时间。

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