a great number of 许多的这里的为什么一定要a来组成固定词组啊?为什么不用其他,a到底是啥意思啊?这里用a我真的很不爽

a number of、a great number、a great many、a great deal of、a plenty of五个词都表示“许多的”有什么区别? a great deal of=a great number of吗 A great number of 与 The number of 的区别 a great number of+可数/不可数? 英语中表示许多大量意思的短语的区别plenty of a lot of lots of a quantity of quantities of a number of a great amount of amounts of a great deal of a good many of 英语翻译a number of 是许多的意思，加上good /certain与加上great是一个意思吗？ a number of , a small number of , a great number of各是什么意思 有“许多”英文单词some,any,many,much,little,a little ,few,a few,a lot of, lots of, lot of,a great number of,number of,plenty of 看了很多资料,至今还是分辨不清楚,求人讲解. a great deal of,a great deal,a great number of,the number of有什么区别? a great deal of和a large number of区别 英语中“许多”的各种说法比如 a great deal of,a number of多举一点 +上后面跟可数还是不可数 the number of,a small number of,a number of.,a great number of,a large/small number of,区别和后面该接可数和不可数名词 a great many ,a great deal ,a great number of的用法 a great number of a great amout of a large number of 都分别后面跟什么数 a great many和a number of的区别 a great many和a number of的区别 a great deal of的用法,a great number of 等的用法还有没有什么表示大量的,许多的词组,huge amounts of 后面加可数名词还是不可数名词什么的, A good/great many,a large number of ,a great deal(of)的区别