This is the real challenge, and although it may prove ambitious, many countries will arrive at the Cancún conference with renewed hope for the future, thanks to the progress made since Copenhagen.
这无疑是一个真正的难题，但多亏哥本哈根以来取得的进展，尽管完成任务或许难度很大，许多国家仍然会怀揣着对未来的希望来参加坎昆会议。