not more / -er than 與 no more / -er than 結構
比較：
John is not better than Tom.
John is no better than Tom.
前一句表示“約翰不比湯姆好”，屬于普通的比較結構；后一例用了no 情況就不同了。no better than 相當于as bad as，含義是兩人一樣壞。這里，“no 形容詞或副詞比較級 than”所表示的可以說是該形容詞或副詞的反意。
例如： no richer than = as poor as 和……一樣窮
no bigger than = as small as 和……一樣小
no later than = as early as 和……一樣早
同樣地：
I have not taken more than six courses this semester.
I have taken no more than six courses this semester.
前一句的含義是本學期選的課不多于六門；后一句的含義是只選了六門。強調“少”。
上述結構與表示前后都否定的no more...than (= not...any more than)又有所不同：
例：A whale is no more a fish than a horse is.（鯨和馬同樣不是魚。）
另外，在某些結構中，單獨使用more than 也能表示否定概念：
例1：That is more than I can tell. 我簡直不能說。
例2：My trip to Beijing is more than sightseeing. 我去北京不僅僅是旅游觀光而已。
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