the role of the teacher in the classroom
教师在课堂上的作用
She refused to take on the traditional woman's role.
她拒绝承担传统妇女的角色。
In many marriages there has been a complete role reversal(= change of roles) with the man staying at home and the woman going out to work.
许多夫妻彻底交换了角色，男人待在家里而女人出外工作。
It is one of the greatest roles she has played.
这是她所扮演过的最重要的角色之一。
Who is in the leading role(= the most important one) ?
谁扮演主角？
the role of diet in preventing disease
饮食在预防疾病中的作用
The media play a major role in influencing people's opinions.
媒体在影响舆论方面发挥着重要作用。
a key/vital role
关键╱至关重要的作用
1.任务,作用
2.(演员扮演的)角色
3.社会角色
1.the purpose or influence of someone or something in a particular situation
2.the character played by a particular actor in a movie, play, etc.
1.The question of whether China can innovate looms over the country's quest to move beyond its role as the world's factory.
问题是中国能否创新，以实现国家提出的超越“世界工厂”作用的要求。
2.The gene's role seems to be to export substances out of the cells that secrete earwax.
该基因可以控制细胞排出物质以分泌耳垢。
3.The quality of their care cannot be guaranteed and the role of nursing is often under threat.
质量的服务不能保证和护理方面的作用往往受到威胁。
4.Consequently, when others discuss how much they rely on their role models, I feel rather out-of-the-loop.
结果，当其他人在谈论他们是如何如何依赖行为榜样时，我感觉自己像是个圈外人。
5.A tricky question in investing is how much of a role ethics should play in your stock selections.
投资时需要慎重对待的问题，道德规范在你选择股票时应该占多大份量。
6.There is a strong role of visual attractiveness in creating a comfortable, relaxing interior that is often overlooked.
是有一个坚强有力的作用，视觉吸引力，创造一个舒适，放松内部是往往被忽视。
7.The implied claim that mine was the centra role was bound to be an affront to any president.
这种意味着自称我起了中心作用的话，肯定要得罪任何一位总统。
8.The role of the company is to improve the financial and operational performance of these companies and manage capital structure.
公司的主要任务是提高集团下各公司的财务和运营表现，管理公司的财务结构。
9.With the two sides at loggerheads, IMF Managing Director Dominique Strauss-Kahn said the IMF will take a bigger role in currency issues.
在两方僵持的局面下，IMF总裁斯特劳斯-卡恩（DominiqueStrauss-Kahn）说，IMF将在货币问题上发挥更大的作用。
10.Mr. Okada emphasized the role he said the U. S. plays in maintaining peace and stability in East Asia.
冈田克也强调了美国在维护东亚和平与稳定方面所起的作用。