Sometimes a characteristic group of signs accompanied a given disease.
有时一群特征性的体征会伴随着一种疾病。
And the relationship between characteristic group changes and adhesive joining strength was studied.
并对特征基团变化与粘接强度的关系进行了分析。
Representative elements of order Albaillellaria firstly appear in Silurian, which prosperous in Late Devonian, and extinction in end-Permian, is the characteristic group of Late Paleozoic Radiolaria.
阿尔拜虫目放射虫最早的代表出现于志留纪，从晚泥盆世开始繁盛，于二叠纪末期灭绝，是晚古生代特有的放射虫类群。
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