And,he says President Obama needs to take a clear lead on climate change when he attends the summit next week.

VOA: standard.2009.12.09

Sometimes that subtle change can lead to a big change in the function of the protein.

有时候,蛋白质在结构上的小小改变,会导致其功能发生巨大变化

耶鲁公开课 - 生物医学工程探索课程节选

Scientists warn climate change will lead to rising sea levels, more devastating floods and hurricanes, longer lasting droughts and other extreme weather phenomena.

VOA: standard.2009.08.31

and they did it,". He says reforms undertaken by communist dictatorships never lead to systemic change without an active opposition creating what he calls a "civil society movement."

VOA: standard.2009.11.03