非常警戒

The Cop is a 1928 American silent drama film directed by Donald Crisp, Due to the public apathy towards silent films, a sound version was also prepared. While the sound version has no audible dialog, it was released with a synchronized musical score with sound effects using both the sound-on-disc and sound-on-film process. At the 2nd Academy Awards in 1930, Elliott J. Clawson was nominated for an Academy Award in the category Best Writing. Prints of the film exist in several film archives including the Library of Congress.