• 1. key change-over: 换向电键
• 2. change-over key: 换向电键
• 3. change over key: 换向钥 | 转换键

• 1.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。
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• 2.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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