Libraries will often hold reading group sessions targeted to various age groups.
图书馆经常会举办针对不同年龄层的阅读小组讲习会。
The volume and weight of central gland was significantly different in various age groups.
不同年龄段的中央腺体积和重量存在显著性差异。
Significant differences were also observed among various age groups except 25 years group when comparing with the control group.
年龄段比较，除25岁以下年龄段外，其他各年龄段与对照组相比皆有显著性差异。
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