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科研写作:a number of 与 the number of
一般来讲,当谈到的东西(如 days、samples、experiments 等)个数多于 1 时,通常会使用复数动词,
例如:the days were short;the samples were dried;the experiments were repeated。
a number of 也属同一类别,之后使用复数子句,
例如:a number of days passed 或 a number of people were present。
小心不要被词句的不定冠词 a 误导,它用来表示个数多于1的东西,因此需要使用复数名词和复数动词。
the number of 的用法不同,之后接复数名词与单数动词。这是因为它指的是构成一个集或组的确切数目,强调的是精确数量,表达的不是东西数目的多或少的问题,而是确切的数目,
例如:The number of plants in each plot was 25 或 The number of participants was greater in summer than in winter。