Call it what you will, it's still a problem.
不管怎么说，这仍然是个问题。
Had I known that I would never have come.
要是早知道，我绝不会来的。
It is estimated the project will last four years.
据估计，这项工程将持续四年。
This will not be possible in the changed economic climate.
这在经济气候已经改变的条件下是不可能的。
Research will be needed as a preliminary to taking a decision.
作出决定之前需要进行研究。