我是清华大学的周林。
防风林是由树木和其它植物形成的屏障，农民在其农田四周种植防风林。
Windbreaks are barriers formed by trees and other plants. Farmers plant these barriers around their fields.
英雄很难永葆昔日光环，更何况是苏联的英雄。然而在人类实现首次太空旅行的50周年纪念日，尤里·加加林却光芒依旧。
It is difficult for heroes to remain untarnished, still less Soviet ones, but on the 50th anniversary of the first human travel in space, such a fate is reserved for Yuri Gagarin.
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