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Hectic fever at its inception is difficult to recognize but easy to treat, left untended,it becomes easy to recognizebut difficult to treat.

痨病热在起初辨别起来很困难，但是治疗很容易；但现在它已经变为辨别很容易但治疗十分困难。

In the research of the valency of modern Chinese verbs, the two-valence transitive verbs are difficult. That's because the quality of this kind of verbs is huge, and various in style. It's difficult to summarize the overall characteristic.

在现代汉语的配价研究中，二价动词的研究是一个难点，主要是因为二价动词数量庞大，种类繁多，因此不容易总结出总体特点。

Vietcong guerrillas were often difficult to distinguish from civilians and moved effectively in the difficult terrain.

越共游击队经常很难与平民区分开来，并且在复杂的地形中行动迅捷。

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。

Shanghai Institute of Mechanical ＆ Electrical Engineering,Shanghai 200040,ChinaAbstract: With the development of pulse arc welding,especially to foretime some material with high heat tenderness difficult to weldthe situation difficult to weld(such as full position welding,narrow gap welding,and the pipe,thin workpiece need singlefaced welding to make doublefaced moulding).

脉冲弧焊工艺的发展，特别是对一些难焊的、热敏感性高的材料和难于施焊的场合(如全位置焊、窄间隙焊以及要求单面焊双面成形的管件、薄件)，脉冲焊均显出独特的优越性。

"The diagnosis of pneumonia in children with wheezing can be difficult, because the clinical history and auscultatory findings may be difficult to distinguish from those for children without pneumonia," write Bonnie Mathews, MD, from Children's Hospital Boston and Harvard Medical School in Boston, Massachusetts, and colleagues.

July 10， 2009 —根据一项发表於7月号小儿医学期刊的前瞻性世代研究结果，有哮喘症状但没有发烧的儿童，放射线检查证实肺炎的病例并不常见，因此，并不鼓励常规性地建议进行放射线检查。

Ladies and gentlemen,today i want to talk about the differences between english and chinese.english is very different form chinese.the sounds are different .the grammar is different.and the writing is totally diffenent.it is very difficult to speak english well.if you want to speak english well.you must forget about the differences.just practise corract sentences until you are used to them .the more sentences you can blout out.the better you can express yourself.if you believe in yourself and practise crazily every day .you'll make it .you'll conquer english .chinese is the most difficult language in the world .if you can speak chinese,you can speak english.

女士们，先生们。今天我要谈谈英语和汉语之间的区别。英语是非常不同于汉语的。例如发音不同，语法不同，还有就是书写完全不同。想说好英语是件非常困难的事情。如果你想说一口漂亮的英语，你就必须忘记那些不同之处。尽量多操练正确的句子直到你熟悉他们。你能脱口而出越多的句子，你就越能如意的表达自己。如果你相信自己并且每天都疯狂的练习，那么你就会成功。你就会攻克英语。汉语是当今世界最难的语言，如果你可以说汉语，那么你就可以说英语。

Browner with wear. Where size is difficult to assess may be difficult

然而体型大小不是一个用来分辨这四种黑色海燕的好方法。

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 original desulfurizing process used hydramine solvent to deprivate most H2S, then carried out alkali wash and water wash. But organosulfur removal was so difficult that individual qulity data of liquid gas were instability and below grade, such as copper sheet corrosion. Furthermore, treatment of alkali residue was very difficult.

装置原采用醇胺溶剂脱除大部分H2S后再采用碱洗、水洗工艺，有机硫难脱除，液化气个别质量指标如铜片腐蚀不稳定，经常不合格；同时碱渣的处理也较困难。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。