以下词组意思为“许多、大量”
plenty of = a lot of = lots of 修饰可数名词和不可数名词
a large deal of、a large amount of 修饰不可数名词
a quantity of 修饰可数名词
many、much吗?（这是最基础的）
另many + 可数名词复数 = many a + 可数名词单数
much + 不可数名词