有困难的

They are highly empirical and accurate description of the performance of activated sludge wastewater treatment processes is still difficult.

他们有高度的实证研究和准确的表现活性污泥法污水处理过程中仍是困难的。

Picking out a snowboard can be difficult because there are so many brands and types to choose from.

挑选滑雪可以是困难的，因为有这麼多的品牌和类型的选择。

Although there have been many kinds of products, the perfect fingerprint identification system is still a hard research task because of the yawp of the fingerprint, the unlinearity of skin springiness and the secrecy of many literatures for commercial benefit.

尽管在此技术上已有多种成型产品，但因为指纹图的噪声、皮肤弹性的非线性等因素，以及许多文献都因商业利益而未经公开，理想的指纹自动识别系统依然是一个很困难的研究任务。

"It will be difficult for us to win Euro 2004," commented Atletico Madrid starlet Fernando Torres, as there are stronger sides.

"要赢得2004年欧洲杯对我们来说是困难的，"马德里竞技的希望之星费尔南多·托雷斯评论说，因为这届锦标中有更强大的队伍。

In addition, Large Company have large volume of data and storing them is very difficult.

另外，大型的公司往往有大量的数据需要处理，而存储这些数据是非常困难的。

Improve ment of the self- efficiency sense and awakening of teacher's subject consciousn ess, especially the reciprocation of the two, can help the teacher discover, rec ognize and improve oneself according to one's own knowledge and determinacy of t he skill effectively , help teacher meet enormous change and challenge in 21st century.

自我效能感是个体自身潜能的最有影响力的主宰，它在人们做出选择决定时，发挥了核心的作用，激发个体为达到目标付出持久的努力、勇于面对各种挑战、不怕困难和失败、力图实现成就目标。

It needs very outstanding courage and steadfast dedication even after you would have faced tragical lost of your current life status.

该离的离该分的分。这种抉择要有一定程度的勇气，这比一般的勇敢要困难的多。

However, proving axisymmetry for the Onsager model is still very difficult, at least for two reasons: The first is that we lack methods for proving axisymmetry, even though there are method for proving radial symmetry or translation invariance.

但是，证明了Onsager模型轴对称仍然是非常困难的，至少有两个原因：第一，我们缺乏证明轴对称的方法，即使是证明辐射对称或平移不变性的方法。

Walking through the tropic forest is a very difficult matter unless you have a good health and a strong will.

穿越热带森林是一件很困难的事，除非你有很强的体魄和顽强的意志。

This means that the people who helpyou when you are in trouble are your truest friends.

这句话的意思是，在你有困难时会帮助你的人才是你最忠实的朋友。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。