advance showing

An advance showing, as of a movie or an art exhibition, to which a selected audience is invited before public presentation begins.

预审，预看在公映或公开展览之前的预先放映或开放，如电影或艺术展览，只有少数经过挑选的观众被邀请。

going or proceeding or going in advance; showing the way.

先行动或者处在前面；指示道路。