初生射线（primary ray）:是维管束间的薄壁组织竹青:表皮及近表皮含叶绿素的基本组织部分竹黄:髓腔的壁竹肉:介于竹青和竹黄之间的基本组织部分茎的初生生...
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primary -ray 初始γ射线
heavy metal ion primary ray 重初级射线
primary medullary ray 原生芒髓 ; 初生髓线
primary X-ray beam 原X射线束
primary cosmic ray [高能] 初级宇宙线 ; [高能] 初级宇宙射线
heavy cosmic ray primary 宇宙线重原始粒子
composition of primary cosmic ray 一次宇宙线的组成
Production principle, character and primary influence factors of Descartes ray are studied by experiments on the basis of theoretical analysis.
在理论分析的基础上，通过试验着重研究了纤维笛卡尔线的产生机理、特征和主要影响因素。
The presented results also include the relations between scattering factors with therapeutical fields and the distances of primary X-ray source and target plane.
比较的结果还包括均整块和初级准直器的散射与射野大小及离开X射线源距离之间的关系。
The intensity of the secondary radiations is weak compared with the intensity of the primary X-ray beam, and some of it, too, may not escape from the material.
这些次级放射线的强度跟原始x射线相比较弱，而且其中的一部分可能留在了那种物质中。
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