英语词汇has been a challenge怎么读，是什么意思，单词翻译、读音、固定搭配用法和短语词组及例句-英汉双解词典

单词	has been a challenge
释义	challenge n — 挑战 n • 质疑 n • 难题 n challenge v — 挑战 v • 质疑 v • 怀疑 v has-been — 过气 challenge — 将军
随便看	a driving factor a driving force a driving role a drm adr-mechanism adroit adroit adroitly adroitness a drone strike a drop a drop down a drop for a drop from 2010 to 2011 a drop in business a drop in consumer confidence a drop in crop yield a drop in income a drop in performance a drop in rainfall a drop in solution a drop in temperature a drop in the bucket a drop in the ocean a drop in the turnover

英汉双解词典包含2273206条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。

challenge n —