a quantity of ,many of ,masses of ,the number of 的意思及用法

a quantity of ,many of ,masses of ,the number of 的意思及用法 the number of,a number of 的区别及用法 a quantity of与the number of的区别 请问quantity of,number of,amount of的用法 masses of & a large amount of & many of的区别 an amount of,a number of和a quantity of之间的用法有何不同 a number of,numbers of,the number of的用法及区别 a number of 意思及用法 number of的意思及用法 英语语法英语 lots of /a quantity of /quantities of /masses of / am a number of VS a quantity of 懂的请进 a quantity of和a number of的区别