英语单词分类 轻松记单词
adj.费力的；吃力的；勤勉的
副词: operosely 名词: operoseness
英英释义
"worked their arduous way up the mining valley"
"a grueling campaign"
"hard labor"
"heavy work"
"heavy going"
"spent many laborious hours on the project"
"set a punishing pace"
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