He described how another group of students, this time college-aged, were taken this past weekend.

他讲述了上周末另一组学生被绑架的经过，这次遇袭的是大学生。

In both groups, time and time again, a crustacean started out with the elongated body of a lobster only to evolve into the rounder, flatter shape of a crab.

在这两组中，甲壳类动物一次又一次地从龙虾的细长身体开始，只是进化成更圆、更扁平的螃蟹形状。