他们发现，在富含单宁酸的橡树叶上，病毒杀死毛虫的效果要比在白杨树叶子上的效果差得多，因为白杨树叶子的酚含量较低。
They found that on tannin-rich oak leaves, the virus is considerably less effective at killing caterpillars than when it is on aspen leaves, which are lower in phenols.
覆盖提高了杨树叶片养分浓度。
Mulching heightened the nutrient concentrations of poplar leaves.
白杨树叶转成金黄，苍鹰在高空盘旋。
Around me, aspen leaves twirled bright yellow. Far above, an eagle soared.
风吹着白杨树叶沙沙地响。
黄色白杨树叶明亮地反映了即将离去的早晨太阳。
利用国家标准物质杨树叶、甘蓝验证了方法的准确度与精密度。
The accuracy and precision of this method were tested by national standard substances (leaves of aspen and broccoli).
杨树叶在绒山羊瘤胃的有效降解率极显著（P<0.01）高于柠条和猪毛菜；
The PED (Potential Effective Digestibility) of poplar leaves in goat rumen is significantly higher (p<0.01) than those of Caragana and Salsola;
杨树叶片中因含有丰富的多酚、色素、多糖等物质，给蛋白质的提取带来了困难。
Poplar leaves contain abundant interfering compounds such as polyphenols, pigments, polysaccharides and so on, which make it difficult to extract proteins.
池底布满了腐烂的橡树枝和杨树叶，泉水呈琥珀色，象是这些枝叶浸泡出的，淡淡的一池茶。
The spring bottom was covered with rotting oak and poplar leaves and the water was amber like a weak steeping of them, a tea.
以玉米叶和杨树叶为天然纤维素原料，水解糖化率分别达到86 2 %和5 6 0 %。
To the maize leaves and poplar leaves, the hydrolysis efficiency could reach to 86 2% and 56 0%, respectively.
杨树也是一种病虫害发生较多的树种，其中杨树叶枯病作为其中的一项主要病害，严重影响了杨树诸多方面效益。
Poplar is also a species pest occurred more, poplar leaf blight disease is one of the main disease which has a serious impact on many aspects of poplar benefits.
杨树较快的树叶分解速度和生物量增长可大大提高曾经是不宜耕作的沙质土的土壤肥力。
Faster leaf decomposition and biomass growth have created a much more fertile soil on once sandy land, which was not always suitable for cultivation.
白杨树的树叶转变为秋天的颜色。
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.
但是当暴风吹弯了高大的杨树，把树叶吹散成涡旋，当它连根拔起树，吹走建筑的屋顶，谁会怀疑空气的存在呢？
But when a violent wind bends tall poplars and scatters the leaves in eddies, when it uproots trees and carries off the roofs of buildings, who can doubt the existence of air?
但是当暴风吹弯了高大的杨树，把树叶吹散成涡旋，当它连根拔起树，吹走建筑的屋顶，谁会怀疑空气的存在呢？
But when a violent wind bends tall poplars and scatters the leaves in eddies, when it uproots trees and carries off the roofs of buildings, who can doubt the existence of air?
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