角色扮演可以使学生练习语言，说错了也没关系。
Role-play allows students to practise language in a safe situation.
他们扮演着老师的角色，在孩子的语言学习中总是发挥着积极的作用。
They're acting as teachers and they always have an active role to play in their child's language learning.
尽管我们可以使用英语来描述工作场所里的雇员角色，但是计算机需要它们自己的语言来描述服务角色。
While we can use English to describe employee roles in the workplace, computer systems require their own language to describe each service's role.
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