木板外墙是由杨树木制成。
杨树木材主要指次生木质部，是主要的产品器官。
The poplar timber points the secondary xylem mainly, is a main products organ.
酸雨引起杨树木材性质的变异对杨木的加工利用有一定的影响。
The variation of wood properties by acid rain influenced significantly wood processing and utilization .
因此杨树木材的解剖结构可以作为评价杨树材性、品质的指标和选种育种及定向培育的重要依据。
So the important basis that the dissection structure of the poplar timber can be cultivated as the index, seed selection breeding and orientation of appraising the poplar material, quality.
他和工厂的合伙人大卫·休斯利用佐治亚盛产的杨树木和甜橡胶树制造筷子。这类木材弹性好而有韧性。
He and his co-owner, David Hughes, make their chopsticks from poplar and sweet-gum trees, which have the requisite flexibility and toughness, and are abundant throughout Georgia.
周围的树木很繁茂，橡树、杨树还有铁杉。
Trees thickened around him, oaks and poplars, some hemlocks.
树木。木节眼凝视从这些北美洲白杨树的树皮中迸出。
Knots peer out from the bark of these North American aspen trees.
树木。白杨树在加利福尼亚州的内华达山脉是灿烂的在闪烁树叶和白色树皮。
Quaking aspen trees in California's Sierra Nevada Mountains are resplendent in shimmering foliage and white bark.
结合水肥管理，加强树木的养护与化学防治相结合，以测报和防治指标为依据是杨树烂皮病综合治理重要手段。
So we should on the basis of prediction and index, considering the fertilization, trying to conserve the trees and doing some chemical cure, implement integrative management.
青海适合种杨树、柳树、松树等树木。
Qinghai suitable for species of poplar, willow, pine and other trees.
青海适合种杨树、柳树、松树等树木。
Qinghai suitable for species of poplar, willow, pine and other trees.
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