UG：年级以下

“Under Grade”一词在军事等特定机构领域中常被缩写为“UG”，以便在日常记录和沟通中实现快捷书写与高效使用。该术语的中文含义为“年级以下”，通常用于描述某个级别或层级低于标准年级的情况。

Study on the track resistance of concrete effected by wet flyash under grade
湿排等级外粉煤灰对混凝土抗裂性能的影响研究
The Haze of all cases were under grade 1. Conclusions : The corneal thickness became stable 3 months after PRK.
本组病例Haze均在1级以下。结论：PRK术后角膜中心厚度在3个月时趋于稳定；
The genetic diversity and population differentiation of Parashorea chinensis, a rare and endangered dipterocarp, and listed in the Plant Red Book under Grade I, were examined using allozyme analysis of horizontal sliceable starch gel electrophoresis.
运用水平切片淀粉凝胶电泳等位酶分析方法，对国家一级珍稀濒危保护植物望天树（Parashoreachinensis）进行了遗传多样性和居群分化的研究；
Results In 36 cases ( 88 % ) of study group, fibrosis proliferation could be seen in peri bronchial area, especially in the bronchi under grade ⅵ. Respiratory bronchiole and alveoli were also involved in 11 cases.
结果41例中36例（88%）支气管各级分支，特别是Ⅵ级以下的支气管周围出现了程度不等的纤维组织增生，其中有11个病例累及呼吸细支气管及肺泡壁。
Athletes under grade ⅲ were excluded, and 308 athletes included 190 males and 118 females aged ( 20 ± 3 ) years.
308名羽毛球运动员中男190名，女118名，年龄（20±3）岁。

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