a mass of=a lot of,并且他们的用法都一样对吗?

a mass of=a lot of,并且他们的用法都一样对吗? a mass of =masses of吗? the mass of 与 a mass of 有啥区别? mass的用法the mass of 和 a mass of 有什么区别？ a mass of 的近义词和词性 a mass of是什么意思及用法 lots of=a lot of? a lot of 造句 a lot of造句 a lot of have a lot of a lot (of)造句 what a lot of a lot of a lot of a lot of 翻译 a lot of hobbies get a lot of