A single person or a team could perform the user role.
一个人或一个团队可能担任一个用户角色。
For example, we often want to consider: can a certain role perform a particular operation upon a specific object?
例如，我们经常要考虑这样的问题：特定角色是否可以对特定的对象执行特定的操作？
Similarly, a person may perform more than one role.
同样，一个人也可以担任多个角色。
It is important to note that a single person can perform more than one role and that more than one person can fulfill a single role.
请注意，一个人可以扮演多个角色，一个角色也可以由多个人来扮演，明白这点很重要。
At the same time, however, he would perform a beneficial role in two ways.
不过同时，他也在两个方面发挥了有益的作用。
Life is a play, we should perform their role as well.
生活其实就是一场戏，我们就该演绎好自己的角色。
Often a grandparent could perform the role of main carer.
祖父母经常起到主要照顾者的作用。
The police perform a vital role in our society.
警察在我们的社会中起着极其重要的作用。
The police perform a vital role to our society.
警察在我们的社会起着极其重要的作用。
The police perform a vital role to our society.
警察在我们的社会起着极其重要的作用。
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