elusive，crabbed，cramped，deep ；

[例句] 这些注释有助于弄清文中最难懂的部分. The note help to elucidate the most difficult parts of the text.

[例句] 这本书对我来说是最难懂的小说之一. This novel seems to me among the most inaccessible.

[医]foul ；

[例句] 我们会被好闻的味道吸引，难闻的味道则会让我们退避三舍。 We are attracted by nice smells and recoil from nasty ones.

[例句] 两个男人都在抽着难闻的烟斗。 Both men were smoking evil-smelling pipes.

embarrassed，galling，unbearable，[法] trying ；

[例句] 这张令人难堪的照片是怎么落到媒体手中的？ How had this com-promising picture come into the possession of the press?

[例句] 寻找平民志愿者的种种尝试都遭遇了令人难堪的失败。 Attempts to find civilian volunteers have met with embarrassing failure.

inaccessibility ；

[例句] 对水解酶间隔作用作完全分析是很难达到的. A complete analysis of the compartmentation of hydrolases is difficult to achieve.

[例句] 这些要求很难达到. These requirements are going to be difficult to meet.

indigestibility，stodginess ；

[例句] 油炸食品非常难消化。 Fried food is very indigestible.

[例句] 这些难消化的食物沉甸甸地压在我胃里. The indigestible food set heavily on my stomach.

indigestibility ；

[例句] 这对那些对它一无所知的人来说可能显得很难理解. This might seem very perplexing to those who know nothing about it.

[例句] 这本科技书里的一些概念很难理解. Some ideas in this science book are hard to lay hold of.

indocility ；

[例句] 我发觉很难教他什么东西。 I'd be hard pushed to teach him anything.

[例句] 笨人难教. A stupid fellow is difficult to teach.

slightly solubility ；

[例句] 目的研究潜溶剂和环糊精对难溶性药物的联合增溶作用. Aim To investigate the combined effect of cosolvent and cyclodextrin ( CD ) on solubilization of insoluble drugs.

[例句] 目的:探讨溶出介质的离子强度对难溶性药物的丙基甲基纤维素(HPMC)骨架片释药的影响. OBJECTIVE To study the effect of ionic strength on insoluble drug release from HPMC hydrogel matrix.

indelible，memorable，unforgettable ；

[例句] 明亮的流星，或者说陨石，是番难忘的景象。 A bright shooting star, or meteor, is an unforgettable sight.

[例句] 参观博物馆是一段令人难忘的经历。 A visit to the Museum is an unforgettable experience.

god-given，hard-won，scarce，uncommon ；

[例句] 有电视看对于老年人来说是难得的好事. A TV can be a real blessing for old people.

[例句] 认识你是一件难得的事. It is a great privilege to know you.

impracticable ；

[例句] 浮式瑞在远远地用眼睛看着他们这个难办的交涉,暗地里在开心. Fauchery, afar off, amused himself by following this delicate negotiation.

[例句] 这是我经手的最难办的案件之一. This is one of the most puzzling cases I have ever run up against.

grieved，sorry ；

[例句] 你刚才看上去挺难过的。 You looked pretty upset just now.

[例句] 卖掉她的旧住宅,这会使她难过的. She will feel having to sell up her old home.

[医] refractoriness ；

[例句] 马的喘息症难治. Heaves is difficult to cure.

[例句] 我得了很难治的感冒,日夜咳嗽. I had a stubborn cold and coughed day and night.

[医] imperative ；

[例句] 这是一种让人受尽折磨、痛苦难忍的杀人方法。 This is a torturous, agonizing way to kill someone.

[例句] 那一年,我国承受的压力无疑是难忍的. In that year the pressure upon our country was undoubtedly painful.

scrannel ；

[例句] 他的表弟立刻用极其难听的脏话大骂起来。 His cousin was soon cursing luridly.

[例句] 她讲法语带有很难听的口音。 She speaks French with an atrocious accent.

--

[例句] 你为什么把所有难做的事都留给你母亲? Why do you leave all the hard work up to your mother?

[例句] 有的人爱先做难做的工作. Some people tackle the difficult jobs first.

hardy ；

[例句] 很多父母觉得要孩子循规蹈矩是件很难的事情。 Many parents find it hard to discourage bad behaviour.

[例句] 有时最难的并非放下过去，而是学会重新开始。 Sometimes the hardest part isn't letting go, but rather, learning to start over.--Nicole Sobon

--

[例句] 在月底,俱乐部领导人把几个难管的青年搞得服服帖帖. At the end of a month club leader had the unruly youths eating out of his hand.

[例句] 难管的事没人管, 难办的事没人做. Nobody provides the job of difficult canal, nobody does impracticable thing.

--

[例句] 蹒跚摇晃或困难地走动或移动; 跛行. To walk or move along haltingly or with difficulty; limp.

[例句] 举止, 态度:尤指面对危险或困难时的行为或举止. Demeanor or bearing, especially in the presence of danger or difficulty.

--

[例句] 防蚊叮咬好说难做。 Avoiding mosquito bites is easier said than done.

[例句] 你为什么把所有难做的事都留给你母亲? Why do you leave all the hard work up to your mother?