The police play a vital role in our society.

警察在我们的社会中起着极其重要的作用。

Not just for health reasons, but also because it plays a vital role in protecting the environment.

不仅是因为健康的原因，还因为它在保护环境中扮演着重要的角色。

Travel, except during the Dark Ages, has continued to grow and, throughout recorded history, has played a vital role in the development of civilisations and their economies.

除了在黑暗时代之外，旅游业一直在持续发展壮大，并且贯穿有记录以来的历史，始终在各文明及其经济的发展中扮演着至关重要的角色。

But other shareholders have played a vital role.

但是其他的股东也扮演着举足轻重的角色。