a poplar
指单棵树时，poplar 是可数名词，前面用 a/an。
A poplar stood at the end of the lane.
小巷尽头有一棵杨树。
杨木
杨属的各种落叶乔木之一；白杨树的柔软浅色不耐用木材；杨树木材；北温带地区的众多树木之一,具有轻软木材和穗状花；杨树
the soft, light-colored, non-durable wood of the poplar tree
指木材，不指树。
杨属的各种落叶乔木之一
Any of various deciduous trees of the genus Populus.
白杨树的柔软浅色不耐用木材
soft light-colored non-durable wood of the poplar
杨树木材
Wood from the poplar tree.
北温带地区的众多树木之一,具有轻软木材和穗状花
any of numerous trees of north temperate regions having light soft wood and flowers borne in catkins
The carpenter chose poplar for the shelves because it is light and easy to paint.
木匠选择杨木做搁板，因为它轻便且容易上漆。
用法提示：句中的 poplar 是不可数名词，指杨木这种材料。
This table is made of poplar, so it is strong but not too heavy.
这张桌子是杨木做的，所以结实但不太重。
用法提示：poplar 在此指杨木，作介词 of 的宾语，表示制作材料。
She prefers poplar for carving because it has a fine, even grain.
她更喜欢用杨木雕刻，因为它的纹理细腻均匀。
用法提示：poplar 作为不可数名词，表示雕刻用的木材。
指单棵树时，poplar 是可数名词，前面用 a/an。
A poplar stood at the end of the lane.
小巷尽头有一棵杨树。
the + 复数形式特指某处的那些杨树。
The poplars outside the window blocked the view.
窗外的杨树挡住了视线。
指木材时是不可数名词，不加 -s。
These chairs are made of poplar.
这些椅子是杨木做的。
grammar · medium
易错句子Poplar music is loved by young people.
正确表达Popular music is loved by young people.
poplar 是名词，意为“杨树”；popular 才是形容词，意为“受欢迎的”。这里修饰 music 需要用形容词 popular。
grammar · medium
易错句子There are many poplar along the river.
正确表达There are many poplars along the river.
poplar 指“树”时是可数名词，复数形式为 poplars。汉语名词没有复数变化，容易忘记加 -s。
grammar · medium
易错句子This desk is made of a poplar.
正确表达This desk is made of poplar.
表示“杨木”材料时，poplar 是不可数名词，前面不能加 a。加 a 会把意思变成“一棵杨树”，与“用杨木做”不符。
poplar 是名词，指杨树或杨木；popular 是形容词，意为受欢迎的、流行的。二者拼写和读音相近，但词性和用法完全不同。
杨树
A tall poplar tree stood by the river.
河边矗立着一棵高大的杨树。
杨木
The furniture is made from poplar wood.
这件家具是用杨木做的。
银白杨
The white poplar has silvery leaves.
银白杨的叶子呈银白色。
杨树林
We walked through a dense poplar forest.
我们穿过一片茂密的杨树林。
杨树丛
Birds nested in the poplar grove.
鸟儿在杨树丛中筑巢。
颤杨
The trembling poplar's leaves rustle in the breeze.
颤杨的叶子在微风中沙沙作响。
白杨树被砍倒了；永别了，那片绿荫。
In his poem "The Poplar Field," William Cowper writes, "The poplars are fell'd; farewell to the shade."
威廉·柯珀在诗歌《白杨林》中写道：“白杨树被砍倒了；永别了，那片绿荫。”
Dictionary facts from ECDICT, WIKTIONARY.