People have planted a great many trees in order to hold back wind and sand in the desert.

为了阻挡沙漠中的风沙，人们种了很多树。

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It'll have to make three trips back and forth for the three trees.

那样就需要为了这三棵树而往返三次。

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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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Its meticulous records from church documents and sagas, a set of semihistorical books, let the country's 290, 000 residents trace their family trees back to the earliest days.

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Five days of trading the field glasses and taking turns crawling back into the trees to smoke out of sight.

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That means that it may take a long time not only to clear, but also to get, for example, the power companies back in to clear trees and to put things back in place so that folks can start moving back home.

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