D解释一下啊 a bit of 的用法和 a little 的a bit of +名词a little+名词二者都表示一点儿再详细点好吗a bit 后跟形容词 e.gHe is a bit tired.a bit of 后跟名词，e.g He has saved a bit of money.a little 后跟名词或形容词都可以，e.g I'm a little cold.He knows a little English.