What is the main objective of this project?
这个项目的.主要目标是什么？
What time did you get here?
你什么时候到达这儿的？
What in the world did they think they were doing?
他们到底认为自己在做什么？
Things ain't what they used to be.
现在情况不比从前了。
Call it what you will, it's still a problem.
不管怎么说，这仍然是个问题。