The Cassini mission around Saturn has now been extended to 2017 to better study the complex planetary system as its season changes from equinox to solstice.

卡西尼环绕土星的任务目前已延长至2017年，以在其春秋分到冬夏至的季节变化时更好地研究这个复杂的行星系统。

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How much carbon land plants store during photosynthesis, a measure known as net primary productivity, changes from season to season.

净初级生产力被定义为植物在光和作用可以储存的碳的总量，这个值会伴随季节而变化。

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As the season changes, migratory birds begin to arrive at the coastal wetland.

随着季节的变化，候鸟开始陆续到达沿海的湿地。

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Ferrari have started the season with an updated version of last year's car but the move has backfired this season as rule changes in the off-season have left their virtually unbeatable 2004 model well off the pace.

BBC: Reigning world champion Michael Schumacher

He is boldly making these changes even as the crucial holiday season approaches.

FORBES: Too Smart for its Own Good

Migratory caribou in low Arctic Greenland and elsewhere are declining in number as they have not been able to keep their calving season in synch with changes in plant growth.

CNN: The changing face of the Arctic