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by 1992, initialism (acronym) for portable document format, a generic term.
| 词汇 | |
| 词根词缀 | Online Etymology Dictionary pdf by 1992, initialism (acronym) for portable document format, a generic term. |
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英语词根词缀词典收录了54763条英语词根词缀词条，基本涵盖了全部常用英语词汇的词根、词缀及词根记忆法解析，是记忆英语词汇的必备工具。