英语词汇proactive的发音释义、词根词缀、结构分析、同源词、词频及词根记忆法-英语词根词缀词典

词汇	proactive
词根词缀	词源： 1933, in psychology (learning theory), from pro- + active. As an opposition to reactive, attested from 1971 (see react).
随便看	underclass underclassman underclothing under control undercover undercurrent undercut underdeveloped underdog underdone underdressed under-employed underestimate underfoot undergo undergraduate underground Underground Railroad undergrowth underhand underlay underlie underline underling underlying

英语词根词缀词典收录了31503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。