role

柯林斯词典

1. N-COUNT If you have a role in a situation or in society, you have a particular position and function in it. 功能; 作用
Until now scientists had very little clear evidence about the drug's role in preventing more serious effects of infection. 到目前为止，科学家们几乎没有该药物在防止更严重的感染后果的功能的明确证据。
2. N-COUNT A role is one of the characters that an actor or singer can play in a movie, play, or opera. 角色
She has just landed the lead role in their latest production. 她刚在他们最新的作品中取得了主角。

Your role in the project will be strictly defined .
The role of the police is to ensure (that) the law is obeyed .
Television has an important role to play in popularizing new scientific ideas .
The government should be playing a more prominent role in promoting human rights .
The kidney plays a vital role in the removal of waste products from the blood .

She quickly left the chorus for a starring role.
She's done all the important Shakespearean roles apart from Lady Macbeth.
Marlene Dietrich was immortalized through her roles in movies like 'The Blue Angel'.
The six principal roles in this opera have an average vocal range of two octaves .
In despair , the theatre director recast the leading role.