这要求平台扮演更复杂的角色：不仅是市场，更是工具箱、教练员和生态建筑师。
Last year a group of researchers from Nasa, the University of Plymouth and University of Texas called on the UN to include the protection of Earth's orbit in its sustainable development goals.
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Dan told the BBC the monitoring and caring for a severely disabled child meant neither he or his partner got much sleep, were exhausted and also had two other children to care for.
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