杨树；速生丰产林；技术管理理。
Poplar; Fast-grown forest; Technical management.
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乔木的干形好、材质优良、较速生。
Arbors grow fast with good stem shape and good timber.
桉树作为世界上三大速生丰产树种之一，已被人们所公认。
Eucalyptus is one of the three admitted fast growing trees in the world.
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