同一群体的不同动物对同一疾病有不同的表现形式。
Different animals in the colony had different manifestations of the disease.
一群人并不是自动形成一个团队。因此，对于提高团队表现来说，团队建设可能是必要的。
A group of individuals is not automatically a team. Therefore, team building may be necessary in order to improve the group's performance.
当我告诉一群表现出无助行为的学生说，是缺乏努力导致了他们数学上的错误，他们就学会了在问题变得棘手时继续尝试。
When I told a group of school children who displayed helpless behavior that a lack of effort led to their mistakes in math, they learned to keep trying when the problems got tough.
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