金融危机发生前的几年，美国需求推动全球经济增长。
In the years before the financial crisis kicked in, American demand contributed to global growth.
在危机发生前，每年大约有30,000希腊学生在国外学习。
Until the crisis hit, about 30, 000 Greeks a year studied abroad.
在危机发生后，投资率直线下降，再也没有回归到危机发生前的水平。
These plummeted in the wake of the crisis, and have never returned to pre-crisis levels.
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