Usually when we walk through the rain forest we hear a soft sound from all the moist leaves and organic debris on the forest floor," says ecologist Daniel Nepstad.
出自-2013年6月阅读原文
The unpleasant voices have tended to dominate our perceptions," says Daniel Tichenor, a political science professor at the University of Oregon.
出自-2011年6月阅读原文
Talking honestly "People now have the opportunity of expressing support for Obama every day," says Daniel Effron at Stanford University in California
出自-2010年6月阅读原文