two rolls of

two rolls of 英语film作胶卷时两卷胶卷是two rolls of film 还是two rolls of films? 两卷胶卷用英文怎么说是two rolls of films,还是two rolls of film There are ( ) on the ground.A.two rolls of film B.two rolls There are two rolls of film on the ground ------ ------ ---- I have__in my bag.A.two rolls of film B.two roll of films C. 关于几卷胶卷,用英语究竟如何表达?如两卷胶卷：是two rolls of film还是two rolls of film There are two rolls of flim on the ground有什么错 英语翻译一卷电影胶片是a roll of film ,两卷电影胶片是two rolls of film 还是two ro there are three rolls of film on the ground改错 there are three rolls of film in my pocket改错 rolls是什么意思