To South Americans, robins are birds that fly north every spring.

对南美人来说，知更鸟是每年春天都会飞到北方的一种鸟。

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They fly to very specific places in South America and will often come back to the same trees in North American yards the following spring.

它们会飞往南美几个特定的地方，然后在第二年春天又飞回到北美院子里的同一棵树上。

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When it is warm, they start to back north in the spring.

天气暖和的时候，它们就会在春天启程返回北方。

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In the spring, the female monarchs leave Mexico and fly as far north as the American state of Kansas.

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During spring, warm air moves north and mixes with cold air remaining from winter.

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That's the spirit that led students here at Nashua North to spring into action in the wake of the tragedy in Haiti.

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The survivors floated down the Amur, wintered at the river's mouth and in the spring turned north into the Sea of Okhotsk.

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That desperate spring, North won a School Improvement Grant (SIG) and began the transformational model that required a complete restructure of school leadership.

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