难

The research of constituent of skin of the contrast that the article cleans a method through to a few kinds commonly used vitta and vitta knot dirty, rust, it is difficult to decided clean vitta clean plan, undertook introductory to washing flow, principle and filter cloth cleaning device accordingly, it is difficult to was solved clean vitta clean a problem, improved working condition of the worker, ensured person is safe, improved productivity, managing the sources of energy.

文章通过对几种常用油管清洗方法的对比以及油管结垢、锈皮组分的探究，确定了难清洗油管的清洗方案，并对相应的清洗流程、原理以及清洗装置进行了介绍，解决了难清洗油管的清洗新问题，改善了工人的工作条件，确保了人身平安，提高了生产率，节约了能源。

It will be hard to hide your vulnerability and to control your temper.

你很难掩饰自己的脆弱，也很难控制自己的脾气。

The majority of the students thought of the lack of practice or contact as the main factor in their difficulty to master writing and oral skills.

而大部份学生都认为疏於练习或难於接触，是导致他们难於掌握书写语文及对话的主要因素。

Its the most difficult to be a doctor in japan in 'li ke'.also,its the most difficult to pass law exam in'wen ke'.but i must study hard,and i know you want to be a doctor too.so please fight together.when we grow up,we can chane ideas.

在日本，理科最难考的是医生，文科最难考得是法律。我一定要努力学习，我知道你也想当医生，那让我们一起奋斗，当我们长大后，就可以互通有无了。

The key part of this project is the application of high effective degradative microorganisms for aromatic hydrocarbons and nitrify bacteria for biological nitrogen removal in the treatment of recalcitrant industrial wastewater.

本项目的关键技术是将人工筛选的芳香族化合物降解菌和生物脱氮的硝化细菌应用于难降解的工业废水处理工程。技术特点是：可在去除难降解有机物的同时脱除高浓度的氨氮。

Difficile is not as strong as that between the infection and antibiotics.

然而，他强调，胃酸分泌抑制剂与难治梭胞杆菌之间的关系并不像感染与抗生素之间那样紧密；必须要重视的是，感染难治梭胞杆菌的最大风险是使用抗生素，而且住院老年病患的风险最高，我们必须了解难治梭胞杆菌引起的感染越来越常见，且越来越严重，因为新的抗药性菌种已经被发现，因为感染这些高抗药性细菌的病患对治疗反应不佳，这样的课题已经受到重视。

We shall find many of our le o very hark,but let us co ider that the harder they are the better they will doto us if we will persevere and learn them thoroughly.

我么会发现，许多功课非常难，但是我们得记住，那门功课越难，将来对我们的好处就越大--只要我们能持之以恒，完全弄懂。

PCBs is composed by several metals and nonmetals including resin and Fiberglas etc, and metals and nonmetals are combined tightly, so it's difficult to be liberated and to be separated.

电路板是玻璃纤维强化树脂等非金属材料和多种金属的混合物，其中金属和非金属紧密结合，分选难，在电子废弃物中最复杂、最难处理，处理时要求技术含量高。

However, the fact that consumers rights and interests in the commodity house market have been repeatedly encroached has become a growingly hot issue.

但在商品房市场消费者权益屡屡受到侵害，突出表现在商品房质量较差，价格过高、广告虚假、合同不平等、面积&短斤少两&、权属证明难办理、开发商证照不全从事欺诈性交易、承诺不兑现、物业管理不规范和消费者投诉处理难等十类典型问题。

Do you think ,because i am poor ,obscure ,plain ,and little ,i am soulless and heatless?you think wrong !i have as much as you ,and full as my heat!and if god had gifted me with some beauty and much wealth ,i should have made it as hard for you to leave me ,as it is now for me to leave you .

难道就因为我一贫如洗，默默无闻，长相平庸，个子瘦小，就没有灵魂和心肠了吗，你不是想错了吗我的心灵跟你一样丰富，我的心胸跟你一样充实，要是上帝赐予我一点姿色和充足的财富，我会使你很难离开我，就象现在我很难离开你一样

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。