It actually specifies the number of frames before the next trailer frame is drawn.

实际上它指定了在下一帧被显示之前的帧数。

youdao

The only trouble you might have is with the leaf icon, but I have attached a high quality picture that I drew from a frame grab of a high resolution trailer.

你可能遇到的唯一问题就是那叶子图标，不过我附上了一张从高清影片剪辑中截取的清晰图片。

youdao

In this paper the counting process of the Hysteresis Loop counting Method is translated into a FORTRAN program, the time history of load of chassis frame-of the trailer is counted with the computer.

本文按滞后环法编制成FORTRAN语言的计算机程序，对拖车车架的实测随机载荷时间历程进行计数。

youdao

Jackson told the Hollywood Reporter that he had no plans to shoot a trailer for the film using the same 48-frame-per-second technique.

BBC: Peter Jackson unsurprised by critics of Hobbit footage