He is one of the experienced engineers in the factory whose hard work is repaid. 此时，先行词是engineers。
至此，网友理解正确。这里 one 是泛指其中之一，如果修饰 one 的话需要特指，需加 the only。对比一下：
He is one of the experienced engineers in the factory whose hard work is repaid.
他是工厂里有经验的工程师之一，他的辛勤劳动得到了回报
He is the only one of the experienced engineers in the factory whose hard work is repaid.
他是工厂里唯一一个辛勤工作得到回报的有经验的工程师。
但是，以下理解是错误的：
请问能否选择factory 做先行词，如果可以，将句子改为He is one of the experienced engineers in the factory where hard work is repaid.说的通吗？——句子语法正确，但不是句子原意。
