For this reason the northern hemisphere enjoys summer while the southern has winter; and vice versa, when we have mid-winter, people in the other hemisphere are in the midst of summer.

因此，当北半球正享受着夏季的时候，南半球则正在经历着严冬，反之亦然，当我们处在冬天的时候，南半球的人们正在过着夏天。

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But the course swine flu will take in the Southern Hemisphere - and, this coming fall, in the Northern Hemisphere - still isn't clear.

但是猪流感会在南半球怎样传播——还有，今年秋天，它在北半球的传播路线——这些都还不清楚。

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In general plant growth and consequently the amount of carbon plants store increased in the Northern Hemisphere and decreased in the Southern Hemisphere.

基本上在北半球，植物在生长过程中会不断增加碳的吸收量，而在南半球，情况则刚好相反。

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More active travellers might consider the annual World Naked Bike Ride, happening on 10 March, 2012 in the Southern Hemisphere, and in June in the Northern Hemisphere.

BBC: Strip down for the end of summer

The sun's magnetic north and south poles were in their respective northern and southern hemisphere several months ago.

CNN: Sun flips magnetic field

The comet is already visible through telescopes in the Southern Hemisphere, and it should swing into view over the Northern Hemisphere beginning around March 8.

CNN: Welcome to the year of the comet (we hope)