难获得的

The total RNA of BuckWheat cotyledon extracted by this method has good completeness and high purity,and is suitable fort-PCR and RACE.

尽管RNA的提取已经成为很成熟的技术，但在实际研究中经常很难做到顺利获得质量好的RNA。

Through roasting, making acid from flue gas ,regrinding roasted tailing,extracting gold by CIP process,the cyanide tailings are well treated and no longer difficult to be sold.

采用焙烧、烟气制酸、焙砂再磨、氰化炭浆提金工艺处理金山金矿氰化尾矿，较好地解决了金山金矿氰化尾矿销售难问题，提高了矿产资源的综合利用程度，在保护环境的前提下，获得了较好的经济效益。

It is difficult to get the analytic solution of difference equation by using traditional methods with computer.

摘要利用传统方法很难在计算机上实现差分方程的解析解求解，本文提出了一种获得差分方程解析解的线性算法，该算法的基础是完全线形变化法。

After a night of spiritual reading with her hunky gurn,Samantha began to feel things she hadn't felt in a very long time, frustrated and horny.

萨曼塔在彻夜阅读了她的精神导师建议的书籍后，她又开始重新获得了那种失去了好久的感觉，欲火难耐。

By 2006, the mediocre performers had much less chance of chalking up a long tenure.

而到了2006年普通的老板已经很难再有机会获得这样长的在职权了。

Western governments, with newly acquired control over their once private financial systems, can hardly fail to sympathise with China's efforts to cajole banks into funnelling state money towards the real economy.

一些西方国家政府刚刚获得了曾经私有的金融体系的控制权，它们很难不与中国保持一致步调：诱使银行将国有资金注入实体经济。

The beam is considered one of the most difficult Olympic events,with gymnasts performing pirouettes and backflips on a beam measuring just four inches across.All Nadia did was record three more perfect scores and her second gold medal.-edited by: ycenglish.com

平衡木被认为是最难的奥运项目之一，体操运动员在直径只有四英寸的横梁上旋转和后弓翻，娜迪亚在这个项目上获得了三个满分，夺得第二枚金牌。

Q: Why do American student visas seem so much more difficult to obtain than those for other countries?

问：为什么获得美国的学生签证似乎比其他国家的都要难？

The students are startled. They can hardly conceive of a career that was not preplanned. They can hardly imagine allowing the hand of God or chance to nudge them down some unforeseen trail.

因为他们很难想象在未经准备的情况下也可获得一份工作，他们无法相信上帝之手或者机缘能把他们推向不可预知的未来。

This web-like democratising of description ("off-page" factors) made it harder to trick the search engines, and Google gained massive market share simply by being a bit more accurate than its competitors.

这说明网络状的民主化，这样就更难欺骗搜索引擎，谷歌获得了只要有少许超过其竞争对手准确巨大的市场份额。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。