住;Researchers are experimenting with field covers of such nitrogen-rich plants as Berseem clover, said Jim Brandle, a university professor in shelterbelt ecology.
吉姆•
兰多（一位研究防风林生
大教授）说，科研人员们正在尝试在农田里种植苜蓿等含氮量高植物。
Researchers are experimenting with field covers of such nitrogen-rich plants as Berseem clover, said Jim Brandle, a university professor in shelterbelt ecology.
吉姆•兰多（一位研究防风林生大教授）说，科研人员们正在尝试在农田里种植苜蓿等含氮量高植物。
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