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The challenge is especially difficult in Amazonia.

挑战来自亚马逊地区的困难。

Yu rang determination to remain unchanged, he said:"I do it is very difficult to make, and why do you want those who are masters of ambidexter person feel ashamed!"

豫让决心不变，他说："我做的事是很难办成的，之所以这样是想让那些对主人怀有二心的人感到惭愧！"

Chapter 3 inducts the requirements to be protected by the law and puts forward the views on copyright of the infringing imitation which is the difficult and ambiguous point existing in practice.

第三章"临摹作品的可著作权性：其他相关问题"归纳了作品受著作权法保护所应该满足的要件，并针对实践中存在的难点和模糊点——侵权临摹作品的著作权的认定问题提出了笔者自己的看法。

In fact, the calculation of income used to be an ambiguous concept, difficult to achieve precision.

事实上，收入的计算是用一种模棱两可的概念，难以实现的精度。

The elephant population has stabilized at more than 200, officials say, though the animals amble through a remote territory that straddles the border with Laos, making it difficult to count them.

官方说大象的数目已经稳定在200头以上，虽然这些动物生活在遥远的中挝边界上，很难去统计。

It is quite difficult to effectively treat amblyopia at this point.

到了这一步，就很难有效地治疗弱视了。

That's difficult for most small, innovative companies in need of funding, says Qiang Yu, chief executive of Shanghai Ambrosia Pharmaceuticals.

上海安普生物科技有限公司（Shanghai Ambrosia Pharmaceuticals）的首席执行官俞强说：对大多数需要资金的小的创新企业来说，达到这些标准很困难。

It is difficult for her to scale and ford step by step, the amentia got finally.

她从生理需求一步步艰难跋涉，最后弄的精神错乱。

Americium has lots of species in aquatic solution. It is difficult to measure the distribution of americium species while they can be calculated by many geochemical software.

Am在水溶液中的形态分布复杂，直接测量困难，使用相关软件依据热力学常数推算核素的形态分布简单可行。

However, the operative site in optical center, the influence of the operator and the equipment, make almost all patients have the different degrees of ametropia and asthenopia and influence the recovery of the vision. These questions are very difficult to solve.

但手术部位多在光学中心，加之手术人员、设备等诸多因素的影响，几乎所有患者术后均存在不同程度的屈光不正而影响视力恢复，并引起不同程度的视疲劳，一直是眼科界难以解决的问题。

Liapunov—Schmidt method is one of the most important method in the bifurcation theory.

Liapunov—Schmidt方法是分叉理论的最重要方法之一。

Be courteous -- even when people are most discourteous to you .

要有礼貌──即使当別人对你最不礼貌的时候。