The moon travels in an elliptical orbit in relation to the equator, swinging back and forth over the northern and southern hemispheres.

月球在与赤道相对的椭圆形轨道上运行，往返于南北半球的上空。

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But from both the northern and southern hemispheres, cold air is constantly pouring towards the equator in order to fill the vacuum thus produced.

这样，来自北半球和南半球的冷空气就会不断地涌入赤道附近，补充由于热空气上升造成的真空。

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WHO has been monitoring epidemiological and virological evidence from all parts of the world, including both Northern and Southern Hemispheres, to determine when the pandemic is over.

世卫组织一直在监测来自世界所有地区(包括南、北半球)的流行病学和病毒学证据，以决定大流行的结束时间。

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But because of the difference in seasons between northern and southern hemispheres, almost all the quota which was filled by May came from Brazil.

ECONOMIST: Agricultural trade