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- Primary xylem Xylem derived from the procambium in the young plant. 初生木质部：指幼嫩植物中来源于原形成层的木质部。
- Protoxylem The PRIMARY XYLEM elements that are formed from the procambium first. 原生木质部：初生木质部的成分，最早由原形成层形成。
- The part of the primary xylem that differentiates after the protoxylem and is characterized by broader vessels and tracheids. 后生木质部初生木质部中不同于原生木质部的一部分，以更宽的导管和管胞为特征
- In nonwoody plants the primary xylem is the only water-conducting tissue, but in mature plants with secondary growth this function is mostly taken over by the secondary xylem. 在尚未木质化的植物中，初生木质部是唯一的输水组织，但在具有次生生长的成熟植物中，该功能大多由次生木质部行使。
- Primary meristem;primary xylem. 初生分生组织；初生木质部
- Anatomical structure of vegetative organ of Amphicarpaea edgeworthii Beath was studied and the results indicated that the primary xylem of seed root in Amphicarpaea edgeworthii Beath was tetrarch. 摘要对两型豆的营养器官进行解剖学研究表明，两型豆根的初生木质部为4原型；
- primary meristem; primary xylem. 初生分生组织；初生木质部
- 4) Primary xylem is of centrarch maturation; 4)初生木质部发生顺序为心始式;
- The disease is still in its primary stage. 这疾病仍然在初发阶段。
- The little boy left primary school at eleven. 这个小男孩十一岁时小学毕业。
- The results showed that the primary xylem of the root is diarch, triarch and tetrarchy; 结果表明：根的初生木质部为二原型、三原型和四原型；
- Sure. We are friends since primary school. 当然，我们从小学就是朋友了。
- I started primary school when I was 5 years old. 我五岁时开始读小学。
- A primary cause of Tom's failure is his laziness. 懒惰是汤姆失败的主要原因之一。
- Primary school teachers use a lot of visual aids. 小学教师使用大量的视觉教具。
- Love and hatred are primary emotions. 爱和恨是基本的情感。
- The Democratic primary was held this month. 民主党候选人初选於本月举行。
- the part of the primary xylem that differentiates after the protoxylem and is characterized by broader vessels and tracheids 后生木质部，初生木质部中不同于原生木质部的一部分，以更宽的导管和管胞为特征
- Primary education comes under the umbrella of local government. 小学教育受地方政府的保护。
- He only accepted the primary education off and on in his childhood. 他小时候只断断续续地接受过初等教育。
