查询词典 difficult task

For them, learning a language is a very difficult task.

对他们来说，学习语言是一件很艰苦的工作。

For them, learning a language is a very difficult task.

对他们来说，学习一门语言是非常困难的事情。

For them, learning a language is a very difficult task.

对他们来说，学习一门新的语言是件很难的事情。

For them, learning a language is a very difficult task.

对他们而言，学习一门语言是一件非常难的事。

For them,learning a language is a very difficult task.

对于他们来说，学习语言是一项很困难的任务。

For them,learning a language is a very difficult task.

对于他们来说，学习一门语言是一件很困难的任务。

But, as with humans, where to draw the line between nature and nurture is a difficult task.

但是，正如人类在哪里划清界线之间的性质和培养是一项艰巨的任务。

In a barter economy it would be necessary to determine how many plates were worth one hundred weight of cotton, or how many pens should be exchanged for a ton of coal, which would be a difficult and time-consuming task.

根据原文的上下文，我们可猜测出barter economy就是&物物交换经济&，由此可知正确答案为C：货物被交换，而不是用货币。

Meanwhile, the most difficult task for simulation and optimization of heterogeneous distillations is to determine whether the liquid phase is stable in column stages or packing sections, which is also one of the focuses of this dissertation.

对三相共沸精馏过程而言，一个汽相和两个液相(来源：ABC论文68网www.abclunwen.com)形成汽液液三相共存现象，第二个液相会或多或少地改变精馏过程的流体力学特性并最终影响过程的传质分离效率。

We recommend using PicoContainer when your application consists of many different components that are related to each other. Instantiating a lot of objects and lacing/connecting them in the right order can be difficult task.

当你的应用中包含大量相互关联的不同组件时，对大量对象的实例化并将它们按照一定的顺序关联起来变得困难时，我们建议你使用picocontainer

I can do simple painting, carpentry and plumbing.

我能做简单的油漆、木工和修水管等工作。

The motivations, notations and outline of this work are also given in this chapter.

从这个意义上讲，这些时滞是无害的。然后用实例说明这三个定理的应用和互不包含性。