空地的规模史无前例，它们将大量的二氧化碳气体释放到了大气中，因而引发了第一次人为导致的全球变暖。
The unprecedented land clearance released vast quantities of carbon dioxide into the atmosphere, triggering for the first time humanly caused global warming.
现在漏油已被控制，一场史无前例的大规模环境清理正在进行中，我们也在竭尽全力帮助那些事故的受害者们。
The oil has now been contained, clean-up is underway on an unprecedented scale and we are working hard to support those whose lives have been so terribly affected.
它正在进行的城市化，其规模史无前例。
It is becoming urbanised on a scale unprecedented in history.
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