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PHILIP
references and index 这个词组的意思是：“参考文献和索引”，有一点不明白，这里为什么reference使用的是复数（plural），而index使用的是单数（singular）。
Dec 7, 2012 12:38 AM
Answers · 2
因为参考文献有很多，索引或者目录只有一个。
December 13, 2012
你的问题不是很清晰哪
December 8, 2012
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PHILIP
Language Skills
Chinese (Mandarin), Chinese (Shanghainese), Chinese (Taiwanese), English
Learning Language
English
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