杨柳的英文：
(n) willow tree
(n) poplar and willow trees

参考例句：

The beautiful sparse shadows of the arching willows were like a picture etched on the lotus leaves
弯弯的杨柳的稀疏的倩影，象是画在荷叶上。

Where willows harmonize the wind And green hills lighten the cares of the world.
杨柳散和风,青山澹吾虑。

They identified it as a member of the genus Salix but could not determine the species
他们确定它是杨柳属，但无法确定是哪一种。

Far and near, high and low around the pool were trees, most of them willows.
荷塘的四面，远远近近，高高低低都是树，而杨柳最多。

willow是什么意思：
n. 柳树；柳木制品
adj. 柳木制的

spontaneous growth of willow
柳树的自然生长

Willow twigs are pliable.
柳条很软。

There are two birds in the willow.
柳树上有两只鸟。

tree是什么意思：
n. 树，木料，树状物
v. 赶上树；爬上树；逃上树

The trees are sparse.
树木稀疏。

The trees are in blossom .
树上鲜花盛开。

the parent tree
母树

poplar是什么意思：
n. 杨树

an avenue of poplars
白杨树的林荫大道

I eulogize the tall and straight trunk of the white poplar.
我赞美白杨树那挺拔的株干。

Snow has bent the poplar over nearly to the ground.
在雪的重压之下，杨树枝垂向地面。