She said the annual reports, mandated by an act of Congress in 2000, are intended to encourage nations to act where necessary with criticism and the threat of possible U.S.sanctions.

VOA: standard.2009.06.16

As completely as was possible and is necessary, would you choose to do it?

如果完全可能而且必要，你会这样做吗？

麻省理工公开课 - 媒体、教育、市场课程节选

Their task is to find common ground, including on reduction of greenhouse gas emissions, promotion and transfer of new more eco-friendly technology and the necessary funding to make this possible, especially for the less developed and poorer nations.

VOA: standard.2009.12.08