Predicting the return on the stock market over a few years is difficult if not impossible, but predicting it over the long term is easier.
即使可能，预测几年内的股市盈利是有困难的，但是预测长线回报则简单一些。
He should know. The BlackBerry itself would be impossible without theoretical insights developed 100 years ago by the first quantum physicists.
他也应该知道，没有100年前第一代量子物理学家所奠定的理论基础，如今就不可能有黑莓。
He wrote the book because "I've been asked hundreds of times over the past 30 years, 'How can I deal with this impossible boss?'" he says.
他表示，之所以会写这本书，是因为“在过去30年里，我被无数次问到这个问题：‘我该怎么跟这位让人难以忍受的老板打交道？’”
"In recent years,these companies have become much more sophisticated, up to the point where it's impossible to tell the difference between the counterfeit cigarettes and the actual cigarettes."
VOA: standard.2010.08.11
The admiral says the situation in Iraq seemed impossible to resolve a few years ago, and,although the two countries are very different,and progress in Iraq is not a guarantee of progress in Afghanistan, it does give him reason to be hopeful about Afghanistan - even during the current period of heavy violence and at best,slow progress.
VOA: standard.2010.07.22
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