1、
作用
例：
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.
角色
例：
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。
3、
职能
例：
The head coach role held by Kelvin Travis will remain how it has always been
怀念旧莳光
