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- primary medullary ray 初生髓射线
- Collateral or bicollateral vascular bundle, developmental pith and medullary ray are obvious. 髓部发达，髓射线明显。
- Vascular cambium possesses two distinct types of initials, ray initials forming medullary rays, and fusiform initials producing xylem and phloem elements. 维管形成层具有两种明显的分生组织，射线原始细胞形成了髓（还应包括维管射线，译者注）射线；纺锤状原始细胞形成了次生木质部和次生韧皮部。
- Ground meristem The central region of the apical meristem from which the ground tissues of pith, cortex, medullary rays, and mesophyll differentiate. 基本分生组织：位于顶端分生组织的中部，髓、皮层、髓射线以及叶肉这些基本组织均是由基本分生组织分化而成。
- The cut slices slightly across the medullary rays, accentuating the vertical grain and minimizing the “fleck.” Rift grain is restricted to Red Oak and White Oak. 切口刚好穿过木射线，着重直纹和减少“射线斑”，裂切只限于红橡和白橡。
- Ground meristem The central region of the apical meristem from which the ground tissues of pith, cortex, medullary rays, and mesophyll differentiate. In root meristem it is also called periblem. 基本分生组织：位于顶端分生组织的中部，髓、皮层、髓射线以及叶肉这些基本组织均是由基本分生组织分化而成。根部分生组织也称为皮层原。
- 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。
- Sure. We are friends since primary school. 当然，我们从小学就是朋友了。
- medullary ray; pith ray 髓(射)线
- 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。
- medullary ray 髓射线,髓线
- Love and hatred are primary emotions. 爱和恨是基本的情感。
- The shortening of the medullar rays naturally decreases the sound velocity a lot and, consequently, reduces the vibration capabilities of the instrument. 材料虽然没拿，但因此认识他太太，后来为材料的事也联系过很多次，只是材料总是不合心意，生意没成但人还是认识了。
- The Democratic primary was held this month. 民主党候选人初选於本月举行。
- secondary medullary ray 次生髓射线
- 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。
