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。

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

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这意味着南半球和北半球会在一年的不同时间段朝向太阳或背向太阳，引起接受的光照量的变化和并产生季节变化。

This means the northern and southern hemispheres will sometimes point toward or away from the sun depending on the time of year, varying the amount of light they receive and causing the seasons.

youdao

此次耀斑是从太阳南半球的活跃区1158区延伸开来，此前太阳南半球的耀斑活跃性落后于北半球，此后几天又发生了几次小规模的耀斑活动。

The flare spread from Active Region 1158 in the sun's southern hemisphere, which had so far lagged behind the northern hemisphere in flash activity. It followed several smaller flares in recent days.

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