| 单词 | heptad |
| 释义 | Word Frequency heptad(ˈhɛptæd) noun 1. a group or series of seven 2. the number or sum of seven 3. an atom or element with a valency of seven Word origin C17: from Greek heptas seven |
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英语词典包含233703条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。