后边的介词是in,例如:
1.
Experts say the way you design your home could play a role in whether you pack on the pounds or keep them off.专家们说,你设计房屋的方式可能会影响你体重的增减。
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。
police play a vital role in our society.警察在我们的社会中起着极其重要的作用。