《蒙娜丽莎》的原作是一幅画在白杨树板上的油画，如今收藏在巴黎的卢浮宫博物馆。
The original Mona Lisa is an oil painting on a board of poplar and is housed at the Louvre Museum in Paris.
自然发生的森林火灾甚至比山体滑坡或积雪更能促进白杨树的生长。
Even more than mountainside slides of mud or snow, naturally occurring forest fires promote the survival of aspen trees.
相反，针叶树将侵入白杨树林的边界，越来越多地遮挡白杨所需的阳光。
Instead, coniferous trees will invade the aspen grove's borders and increasingly block out sunlight needed by the aspens.
当灯光再次亮起时，塞巴斯蒂安注意到约翰脸色像死一般惨白，像一片白杨树的叶子一样在颤抖。
When the light was lit again, Sebastian noticed that John was deadly pale and trembling like an aspen leaf.
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.
白杨树的树叶转变为秋天的颜色。
白杨树林往往是一个很大的有机体。
一只红色小猫迷惘地躺在白杨树下。
白杨树上的乌鸦在上空呱呱乱叫。
白色的树，。桦树(即白杨树)。
该处曾有一棵高大的白杨树。
在佐治亚州中部，生长有大量的枫香树和白杨树。
In central Georgia, sweetgum and poplar trees grow in large Numbers.
我赞美白杨树那挺拔的树干。
白杨树实在是不平凡的，我赞美白杨树！
The white poplar is no ordinary tree. Let me sing its praises.
树林已经变得稀薄，增加了白杨树的再生。
The trees had been thinned to increase aspen tree regeneration.
不过爱因森堡是想让我们看一个白杨树林。
白杨树长得又直又高。
黄色白杨树叶明亮地反映了即将离去的早晨太阳。
过一会儿，我们在几棵白杨树下找到一块荫凉地。
After a while, we found a shady place under some poplar trees.
夜风处，白杨树的叶子沙沙响，它们是在吟唱离歌吗？
Night wind Department, poplar leaves rustles, they are singing from the songs?
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.
我们在一棵棉白杨树下找到他，牧羊营附近的那条大河谷里。
We found him under a cottonwood tree in the big arroyo near sheep camp.
照片中金灿灿的白杨树林、风景如画的山脉摄于寒拉斯的东部。
A snap of a Golden Aspen grove and picturesque mountains in the Eastern Sierras.
另一些人认为白杨树只传播扩散水银，而不是把它从环境中清除。
Others believe poplar trees only spread mercury rather than remove it from the environment.
滑雪索道悬吊在白杨树上空，白杨树的叶子刚刚开始染上一丝黄色。
Ski lifts idled above aspens, their leaves just beginning to show a tinge of yellow.
这对雄海狸来说可不是好事，因为没有了白杨树它们无法在河溪里筑坝。
And that was a problem for Johnny beaver, because without the aspens he couldn't dam the rivers and streams.
这对雄海狸来说可不是好事，因为没有了白杨树它们无法在河溪里筑坝。
And that was a problem for Johnny beaver, because without the aspens he couldn't dam the rivers and streams.
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