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In Japonica heterosis utilization, the purity of hybrid seeds was sometimes low due to the self-fertility and/or unstable sterility of some BT type Japonica cytoplasmic male sterile lines. For the WA type Japonica CMS lines, their sterility is much stable, but there is also some difficult to take use of them because their flowering habit is bad and it is very difficult to restore their fertility. The HL type CMS lines were identified to have the same flowering habit and outcrossing rate with the BT type CMS lines in Japonica hybrid rice. Moreover, the sterility of HL type CMS lines was more stable than that of BT type, and their restorable characteristics was better than that of WA type.

部分BT型粳稻不育系存在自交结实现象，不育性的稳定性较差，影响杂交种的纯度；WA型粳稻不育系虽然不育性稳定，但开花习性差，育性最难恢复，应用难度较大；HL粳稻不育系开花习性及异交结实率与BT型粳稻不育系无显著差异，育性稳定性明显好于BT型粳稻不育系，可恢复性明显好于WA型粳稻不育系，较好地协调了育性稳定性、开花习性和可恢复性几方面的矛盾。

However, the market on a large number of textbooks Shen common problem is that repetition, superficial, reference the original examination questions too much, too little original composition, laws and methods of analysis of the theory of summing up the lack of height and depth of expertise, limited to the rough way, to enable candidates to reading on the theory of Shen understanding still remain at the sophomoric level, very difficult to have a thorough grasp, it is difficult in the short term,"it can not gain."

然而，市面大量申论教材的通病是重复、粗浅，引用试题原文过多，原创成分太少，规律分析与方法总结缺乏理论的高度与专业的深度，限于粗加工的方式，让考生读后对申论的理解仍然停留在一知半解的层次，很难有透彻的领悟，也很难在短时间内"增益其所不能"。

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。

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。

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。

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。

This kind of support,like all government support,requires decisions about the appropriate recipients of funds.decisions based on utility as opposed to lack of utility are straight forward.but a decision among projects none of which has immediate utility is more difficult.the goal of the supporting agencies is the praisable one of supportinggoodas opposed tobadscience,but a valid determination is difficult to make.generally,the idea of good science tends to become confused with the capacity of the field in question to generate an elegant theory.

此种资助也与所有政府资助一样，需要决定合适的投资对象。根据某一项目是否有效来做出决策是明确无误的。但是在几个都没有直接效用的项目中，要做出抉择就特别困难。资助机构的目标是支持好的科学，而不资助坏的科学，那是值得赞扬的。然而要做出正确的抉择却是困难的。人们往往将好科学与该科学是否有能力提出一套完美的理论混淆起来。

One may go wrong in many different ways, but right only in one, which is why it is easy to fail and difficult to succeed-------easy to miss the target and difficult to hit it .

Aristotle 4 犯错的方式有多种，但正确的方式却只有一个，这就是为什么失败容易成功难，不中标的容易，中标的难。——亚里士多德。

As the heat-resistant alloy machining difficult, complex shape parts, or can not be so difficult to use other methods of manufacture, therefore, need to find a new precision of the molding process, they have been handed down from ancient lost wax casting, through the material and Technological improvements, modern methods of Investment Casting Technology in Ancient on the basis of access to important development.

由于耐热合金材料难于机械加工，零件形状复杂，以致不能或难于用其它方法制造，因此，需要寻找一种新的精密的成型工艺，于是借鉴古代流传下来的失蜡精密铸造，经过对材料和工艺的改进，现代熔模精密铸造方法在古代工艺的基础上获得重要的发展。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。