很难

Tetrafluoroethylene-Hexafluoropropylene Copolymers ( FEP) is a kind of broadly used polymer materials. Because of hardly soluble in any solvent, it is difficult to obtain its molecular weight and distribution.

四氟乙烯&六氟丙烯共聚物（FEP）是一种应用比较广泛的高分子材料，但由于很难找到合适的溶剂，很难得到其分子量及分子量分布。

The papers in maths and English are very testing.

数学试卷和英语试卷很难。

It seemed she found it difficult to speak ill of anyone.

她似乎觉得说别人的坏话很难。

The investigators complained about the difficulties of squeezing information out of residents.

调查人员抱怨说很难从居民身上获取信息。

That sounds rather simple, but in fact it's very difficult.

那听来简单，但实际上很难。

Coping with severe drops in temperature can be very difficult.

温度大幅下降可能会很难应付。

It may be quite difficult to establish whose containers leaked or in what quantities.

这就很难确定哪家的容器渗漏,也很难确定渗漏量.

Under the shaded light her expression was difficult to read.

她的表情隐在阴影中，很难读懂。

This is such an unforeseeable situation that anything could happen.

这种情况很难预测，什么事都有可能发生。

Everybody says that military training very memorable indeed memorable, tired like a dog!

人人都说军训很难忘,确实很难忘, 累得像条狗!

The fish are among the hardest to catch and keep in captivity.

该鱼很难捕捉,很难抑制束缚.

However, it is something difficult to control or take action against.

不过，非法贸易是很难控制，或很难采取措施对付的事情。

He said that Speaking Chinese is not so difficult, it was difficult for them to understand the same word in different sentences and read Chinese poets, but writing Chinese charactersis the most difficult part of learning the language.

他说，说汉语其实并不是那么难，他们只是很难理解不同的句子中的同一个词，也很难读懂中国古诗词，但是，写汉字才是汉语学习中最难的部分。

But it is very difficult for traditional class methods to solve effectively those problems and assure the accuracy that make us to search a method that can analysis the problems that are pointed above.

而传统的质量数据分类很难高效地解决上面出现的确定性而且也很难保证其正确率，这就需要寻找适合分析解决以上问题的方法。

It was hard to visualize how it could have been done.

很难想象这是如何办到的。

But while most business travelers have a smartphone and, according to a study by Expedia, 78 percent of them have used it in some travel-planning capacity, corporations still make it hard for their traveling employees to use current technology and integrate their own travel management tools with company programs.

根据便利旅游公司（Expedia）的研究，虽然大部分商务旅行者拥有智能手机，但是只有78%的人用手机规划旅行，公司政策仍让商旅员工很难使用当今技术，很难把自己的旅行管理手段与公司的程序结合起来。

Many parents find it hard to discourage bad behaviour.

很多父母觉得要孩子循规蹈矩是件很难的事情。

It is impossible to say who struck the fatal blow.

很难判断是谁给了致命的一击。

Ffares are tough, but spins are also. And then the athletes must do a strong dismount!

摆腿很难, 翻转也很难. 然后选手必须有一个很稳健的下杠动作.

Werder Bremen will be very difficult — or very entertaining.

不来梅将会很难对付——或者说很难招架.

I find it really hard to drag myself out and exercise regularly.

我发现要让我自己定期出门锻炼真的很难。

This year the airline will be hard-pressed to make a profit.

今年该航空公司将很难赢利。

He is too impulsive to be a responsible prime minister.

他容易冲动，很难成为值得依赖的首相。

I found it hard to keep my temper with so many things going wrong.

出了这么多乱子,我很难不发脾气.

However, it is very difficult to adapt the influenza B virus to Vero cells, and the high-yield production is also difficult to obtain.

在乙型流感疫苗的研制中，乙型流感病毒感染很难适应Vero细胞，并且很难得到持续的高产。

After all, it is hard to have a clear view and be productive if you are a cluttered mess.

毕竟，假如连你自己都混混沌沌的话，你就很难有清楚的想法，也很难提高效率。

Without our friends, we would be hard pressed to get through the tough times and celebrate the good ones.

没有这些朋友，我们很难度过那些困难的时期和也很难庆祝美好的时光。

It is hard to imagine Lineker capable of anything so extreme.

很难想象莱恩克尔能做出如此极端的事情。

It is difficult to exercise self-control, that is, difficult to keep within limit.

自己很难控制, 即很难控制在一定的范围之中.

Adults need to live their own lives and that's difficult with children.

大人需要过他们自己的生活，但有了孩子就很难做到了。