核心问题
few 意为“很少”，“几乎没有”，具有否定意义，quite a few 是否也表示“很少”，具有否定意义呢？
词典解答
quite a few 表示“相当多”的意思,没有否定意义,相当于 a good few。a very few 才表示“很少”的意思,具有否定意义。例如:
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There were quite a few students absent from class today. (Whitford) 今天有好多学生缺课。
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You'll have to wait a good few weeks. (LDCE) 你必须等好几个星期。
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A: Have you seen many houses for sale?
B: No, I've seen only a very few. (CGEL)
A: 你看到有很多房屋出售吗?
B: 没有,我没有看到有什么房屋要出售。
(参见 a good few)