octad八: eight一组: a set; a group; a piece; a b ...八价元素: octad五；五个一组；五年；候；五价元素: pentad八个一组: eight; octad; octette; octonary下载手机词典可随时随地查词查翻译关注微信公众号：chachacidian，回复:八个一组；八价元素，即可在微信中查询翻译
