集体名词是只能表复数意思。而单复数同形的是单数、复数不需要变化形式。
people,police,cattle只能表示复数意义。public,class,team这种是随着语境变化语义发生变化的,单复数也变化。
Many local people believe the development will profit them.
当地的许多人认为,这项开发将对他们有利。
People tend to work hard at this stage of life.
人在这个人生阶段往往发奋努力。
We restrict the number of students per class to 10.
我们将每个班的学生人数限定为10人。