在奥运倒计时一周年来临之际，国际奥委会主席罗格高度赞扬了北京奥运会各方面的筹备工作，并认为北京奥运会将给中国带来丰厚的遗产。

请看《中国日报》相关报道：The 2008 Beijing Olympic Games will offer a great legacy for China, Jacques Rogge, president of the International Olympic Committee (IOC), said yesterday on the eve of theone-year countdownto the world's greatest sporting event.

Rogge also said the IOC was impressed by what Beijing had done to prepare for the Games. "The preparations for Beijing 2008 are truly impressive in every regard," said Rogge.

报告中的“one-year countdown”指的就是“倒计时一周年”。

“Countdown”在此指“倒读数阶段”，前面可根据具体情况添加相应的数字，如：a ten-second countdown（倒数十秒）。

“Countdown”相应的动词词组为to count down，看例句：The final seconds before takeoff were counted down: 10, 9, 8, etc.（起飞进入倒计时阶段：10，9，8……）

ps :这是很久以前的事了