重建过去的气候变化是极其困难的，因为在欧洲和北美，几个世纪前才开始系统的天气观测。
Reconstructing the climate changes of the past is extremely difficult, because systematic weather observations began only a few centuries ago, in Europe and North America.
在过去的11年里，只有一年的天气不利于柑橘作物的生长。
In only one of these last eleven years was the weather unfavorable for growing citrus crops.
过去，这个地区受到令人生畏的地理条件和极端的天气状况的保护。
In the past, the region had been protected by its forbidding geography and the extremities of its climate.
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