However, due to the complexity of the application system, it is difficult to realize.
但是由于应用系统的复杂性，实现的难度也较大。
It is hard for us to realize nowadays how difficult it was for the pioneers.
登山先驱者登山的艰难，我们现在是无法理解的。
It is a very difficult task, but we are able to realize it.
这是一个非常困难但是可以完成的任务。
However, for aircraft design, it is really difficult to realize multidisciplinary optimization.
然而要实现飞机综合优化设计却绝非易事。
You must realize that sometimes it will be difficult to improve a worker's ability.
你必须意识到有些时候提高员工的能力是很困难的。
A very important link is the teaching class management system management system, at the same time it also is the link which most difficult to realize.
其中很重要的一个环节就是课件管理系统，同时它也是最难实现的环节。
A very important link is the teaching class management system management system, at the same time it also is the link which most difficult to realize.
其中很重要的一个环节就是课件管理系统，同时它也是最难实现的环节。
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