While this is very interesting, these are indeed difficult goals to achieve.
虽然这很有意思，这些实际上是非常难于实现的目标。
It is very difficult to save while on the dole but I am determined.
靠救济金想存一些钱是很难的，但我决心已定。
While English can be difficult to learn, it is a very useful tool for communication.
尽管英语学起来可能有点难，但它是非常有用的交际工具。
Machine translation is an open problem while its evaluation is also very difficult.
机器翻译是项很困难的研究课题，而机器翻译评价也不是一件容易的事。
This trick should be done while moving slowly. Landing this trick is very difficult.
这个动作应慢速滑时做，站上去是很困难的。
This trick should be done while moving slowly. Landing this trick is very difficult.
这个动作应慢速滑时做，站上去是很困难的。
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