primary beam 原射线束 ; [核] 初级束流
primary X-ray beam 原X射线束
primary ion beam 原离子束
primary beam energy [物] 一次束能量
primary beam transport 初始束流输送
absorption of primary beam 一次射线束的吸收
primary and secondary beam 主次梁
primary ion beam profile [物] 一次离子束剖面
primary and secondary beam nodes 主次梁节点
primary cesium beam frequency standard 原级铯射束频率标准
The SIMS technique bombards the lunar samples with a primary ion beam that allows the researchers to separate the ions with a magnet, depending on the charge.
SIMS技术可以以离子束轰击月岩样本，从而使研究人员调整电荷水平，用磁石分离出离子。
Their primary weapon was a lightsaber pike with a red beam extending from the tip of the weapon.
他们的主要武器是一支光剑矛并于矛的顶端有一支延伸的红色光束。
The primary cause of breakage is that the dynamic stress exceeded the allowable fatigue limit of the beam, and another cause is that the structure of the beam is unreasonable.
通过计算证明引起断裂的根本原因是动应力超过了梁的许用疲劳极限，另一原因是梁的结构不合理。
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