the xylem of + plant/tree
xylem 通常作不可数名词；特指某棵植物的木质部时前面加 the。
The xylem of a tree carries water from the roots to the leaves.
树木的木质部把水分从根部输送到叶片。
木质部
植物的木质部分:主要由管胞和导管组成的支撑和输水组织。；木质部；[医] 木质部(植物纤维束的)
The water-conducting tissue in vascular plants that carries water and minerals from the roots and forms the main part of wood.
木质部。
A vascular tissue in land plants primarily responsible for the distribution of water and minerals taken up by the roots; also the primary component of wood.
植物的木质部分:主要由管胞和导管组成的支撑和输水组织。
the woody part of plants: the supporting and water-conducting tissue, consisting primarily of tracheids and vessels
The xylem in a tree carries water from the roots to the leaves.
树木中的木质部将水从根部输送到叶子。
用法提示：xylem 作主语，指负责输水的组织。
You can see the xylem if you look closely at a cut stem.
如果你仔细观察切开的茎，就能看到木质部。
用法提示：xylem 作动词 see 的宾语。
A blockage in the xylem stops water from reaching the branches.
木质部中的堵塞会阻止水到达树枝。
用法提示：xylem 作介词 in 的宾语，表示发生堵塞的位置。
xylem 通常作不可数名词；特指某棵植物的木质部时前面加 the。
The xylem of a tree carries water from the roots to the leaves.
树木的木质部把水分从根部输送到叶片。
作定语时 xylem 保持单数，如 xylem tissue、xylem vessels。
Xylem tissue contains tracheids and vessels.
木质部组织含有管胞和导管。
through the xylem 表示经木质部输送，常与 move、travel、be transported 等动词连用。
Water and minerals move through the xylem from the roots to the leaves.
水分和无机盐通过木质部从根部输送到叶片。
说明组成时也可用 be composed of 或 be made up of。
Xylem consists primarily of tracheids and vessels.
木质部主要由管胞和导管组成。
grammar · medium
易错句子Xylem are responsible for transporting water and minerals in plants.
正确表达Xylem is responsible for transporting water and minerals in plants.
xylem 在英语中是不可数名词，表示一种组织，作主语时谓语动词要用单数 is。汉语名词没有单复数形态变化，学习者容易按“一类东西”的复数概念误用 are；此处主语指单一组织，必须与单数动词一致。
grammar · medium
易错句子Xylem consists tracheids and vessels.
正确表达Xylem consists of tracheids and vessels.
consist 是不及物动词，说明“由哪些部分构成”时必须用 consist of + 名词这一固定搭配。汉语“由……组成”中的“由”不提示英语里的介词，学习者常把 consist 当及物动词直接带宾语，漏掉 of。
grammar · medium
易错句子Xylem is one of the main vascular tissue in plants.
正确表达Xylem is one of the main vascular tissues in plants.
one of the + 名词 结构中，of 后面必须接复数名词，因为“其中之一”是从多个同类事物中挑出的一个。汉语“主要组织之一”不体现复数形式，学习者因此漏写名词词尾 -s，应改为 tissues。
两者同属植物维管组织，但功能相反：xylem 把根吸收的水分和无机盐向上输送，phloem 把叶片制造的有机养料输送到植物各处。谈输水、支撑（木材主要成分）时用 xylem，谈输送糖分等养料时用 phloem，二者不能互换。
拼写和读音相近，但指完全不同的东西：xylem 是植物体内输导水分的木质部组织，xylophone 是一种打击乐器木琴。前者用于植物学，后者用于音乐，语义上没有交叉，不能替代。
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