primary vascular bundle [植] 初生维管束
primary fiber bundle 一次肌束
primary conduct bundle degeneration 原发性传导束退化症
The fanning of the primary bundle of light beams (411) is achieved by refraction on rotationally symmetric interfaces (471, 472), which are variably inclined in relation to the optical axis (417).
所述初级光束（411）的发 散通过在多个以不同角度朝所述光轴（417）倾斜的旋转对称界面（471，472） 上发生折射而实现。
However, each row must have a unique primary key, which is a sort of name for that particular bundle of data.
不过，每一行的主键(一种用于特定一组数据的名称)必须是唯一的。
Conclusion: the anterior bundle of UCL of the elbow is the primary restraint to valgus stress and should be the focus of repairing or reconstructive operation.
结论：肘关节内侧副韧带前束是肘关节内侧稳定的主要结构，临床上当肘关节内侧副韧带损伤时应重点修复或重建前束以稳定肘关节。
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