By measuring the proportion of heavier hydrogen and oxygen isotopes along a strand of hair, scientists can construct a geographic timeline.

通过测量一束头发上较重的氢和氧同位素的比例，科学家可以构建一个地理时间轴。

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The fossil record of late Campanian tyrannosauroids of western North America has a geographic gap.

北美西部晚期的坎帕阶霸王龙的化石记录存在地理差异。

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A geographic bias must be corrected too.

地理上的偏好也必须被纠正过来。

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So the group started a competition called the National Geographic Bee to test students' knowledge about places around the world.

VOA: special.2009.05.29

She was a photographer,travel writer and the first female board member of the National Geographic Society.

VOA: special.2011.04.08

You can also find a link to the National Geographic's campaign to help save big cats.

VOA: special.2011.03.23

This fund is purely thematic, and from a geographic perspective, An is decisively Asian biased.

FORBES: The Asian Consumer Is Your Friend

Additionally, confining your purchases to vendors within a geographic region does not strengthen the local economy.

FORBES: We buy local produce because it is better, not because it is local

It is not merely a geographic divide, although they lie over 100km (some 67 miles) apart.

BBC: The Oxford versus Cambridge gloat race