1、困难的 difficult
demanding [d??mɑ:nd??] 
e.g.he found he could no longer cope with his demanding job. 
译文：他发现自己已无力应对那份劳神费力的工作了。
laborious [l??b?:ri?s] 
e.g.keeping the garden tidy all year round can be a laborious task. 
译文：一年到头把花园拾掇得干净整洁也不是件轻松活儿。
formidable [?f?:m?d?bl] 
e.g.the examination paper contained several formidable questions. 
译文：这份试卷中有几道题目很难答。
2、无聊的 boring
dull [d?l] 
e.g.the documentary lasts for more than two-and-a-half hours, and there is scarcely a dull minute. 
译文：该纪录片片长超过两个半小时，却鲜有沉闷之处。
tiresome [?ta??s?m] 
e.g.i had planned to go to your party, but you know i had to finish that tiresome paper. 
译文：我原本打算去参加你的晚会，可你知道我还得完成那令人厌倦的论文。
tedious [?ti:di?s] 
e.g.if tedious tasks could be eradicated, the world would be a much better place.
译文：如果可以消除那些单调乏味的工作，世界将会变得更加美好。
3、忧虑的 worried
anxious [???k??s] 
e.g.the prime minister faces anxious hours before the votes are counted tomorrow night. 
译文：在明晚计票完成之前，首相将面临数小时的煎熬等待。
apprehensive [??pr??hens?v] 
e.g.people are still terribly apprehensive about the future. 
译文：人们对于将来仍然非常担心。
fraught [fr?:t] 
e.g.it has been a somewhat fraught day. 
译文：这是让人有些担忧的一天。
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