他说道这是具有里程碑意义的一年。

"It was a milestone year," he said.

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2009年是北美极具里程碑意义的一年。

Marks a Year of Meaningful Milestones in North America.

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今年是具有里程碑意义的一年，预计今年地球人口将达到70亿。

This year's World Population Day falls during a milestone year, when we anticipate the birth of the earth's seven billionth inhabitant.

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