Cinemad is a commercial played before a movie.

电影映前广告就是在电影上映前播放的商业广告。

These days moviegoers get previews of coming attractions, which is actually cinemad, but entertaining enough to get a pass.

现在去影院看电影的人在电影播放前都会看到几段即将上映的电影的预告片，这其实是电影映前广告，但是因为够精彩，所以也就被默许了。

（中国日报网英语点津 陈丹妮）