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科研寫作:a number of 與 the number of

一般來講,當談到的東西(如 days、samples、experiments 等)個數多于 1 時,通常會使用復數動詞,
例如:the days were short;the samples were dried;the experiments were repeated。
a number of 也屬同一類別,之后使用復數子句,
例如:a number of days passed 或 a number of people were present。
小心不要被詞句的不定冠詞 a 誤導,它用來表示個數多于1的東西,因此需要使用復數名詞和復數動詞。
the number of 的用法不同,之后接復數名詞與單數動詞。這是因為它指的是構成一個集或組的確切數目,強調的是精確數量,表達的不是東西數目的多或少的問題,而是確切的數目,
例如:The number of plants in each plot was 25 或 The number of participants was greater in summer than in winter。