The key to a successful project is to manage change by clearly defining the requirements and to adapt them as needed over the solution development cycle.
成功项目的关键是通过清晰地定义需求来管理变化，并在解决方案开发周期中根据需求适应变化。
Though methane is not as abundant as carbon dioxide, it is twenty times more potent and scientists believe that over the eons it has played a key role in spurring climate change.
虽然甲烷不如二氧化碳量大，但（作为温室气体）其强度是二氧化碳的20多倍，科学家们认为，长久以来它一直是推动气候变化的关键角色。
Though methane is not as abundant as carbon dioxide, it is twenty times more potent and scientists believe that over the eons it has played a key role in spurring climate change.
虽然甲烷不如二氧化碳量大，但（作为温室气体）其强度是二氧化碳的20多倍，科学家们认为，长久以来它一直是推动气候变化的关键角色。
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