实现这些目标从理论上说比较容易，但在实践上却相当困难。
Achieving these goals is relatively easy in theory, yet quite difficult in practice.
对于许多学校来说，要找到关于这个问题的可靠统计数据是相当困难的。
It is actually quite difficult to find reliable statistics on the issue for many schools.
我有最后期限，这会让我和别人生活变得相当困难。
I have deadlines which would make life with someone else fairly difficult.
我是谁，这一点解释起来相当困难。
不过遗憾的是，观测它们相当困难。
没有理解这些，天文学是相当困难的。
当某个人得病时，那样做相当困难的。
从这么大的挫折中恢复过来是相当困难的。
Coming back from such a large setback was extremely difficult to say the least.
要开始执行第二步可是相当困难。
要做一个好的工程师是相当困难的。
听起来这已经够容易的了，但实际上相当困难。
This might sound easy enough, but in practice it can be quite hard.
到那里去相当困难。
这个过程并不复杂，但它是相当困难。
为已知的未知事件做准备相当困难，除非你重视他们。
It's extremely hard to prepare for the known unknowns until you take them seriously.
数学对他来说，相当困难。分数和百分数是第一次见面。
Math is difficult for her; fractions and percentages are completely new.
其实，想检验所有的存在相当困难，也很难使它开口说话。
Verily, it is difficult to prove all being, and hard to make it speak.
翻译中要契合押韵格式相当困难，尽管有些译者这样尝试过。
To match the rhyme scheme is very difficult-though some have tried.
作为企业家，你必然会面临一些相当困难的挑战。
As an entrepreneur, you are going to face some really tough situations.
他觉得没有任何帮助而解决这一难题是相当困难的。
He found it rather difficult to work the problem out without any help.
不少老年人发现要使自己适应变化的时代相当困难。
Many old people find they have great difficulty in adapting themselves to the changing times.
在公开水域，特别是在海洋，它将会变得相当困难。
It will be more difficult in open water, especially in the ocean.
实际上相当困难，因为此类项目涉及如下几个比较复杂的问题。
Quite hard, actually, because this kind of project raises several more complex issues like these.
这样可能会使系统操作相当困难并且有的时候不可靠。
This can make the operation of the systems quite difficult and sometimes unreliable.
然而，验证这些理论相当困难，因此这些理论正确与否无人知晓。
But testing these theories is hard, so nobody knows if they are true.
这是一个相当困难复杂的图像，只是被冒充成简单的抽象画罢了。
It's a very difficult and complex image, masquerading as a simple abstraction.
当然这项任务实施起来相当困难，一不小心，人房两空。
Of course, this task is very difficult to implement, if the people bedroom space.
当然这项任务实施起来相当困难，一不小心，人房两空。
Of course, this task is very difficult to implement, if the people bedroom space.
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