dress rehearsal

音标发音

A clown performs during a dress rehearsal for the "Slava's Snowshow" in Sao Paulo.
在圣保罗的一场“下雪了”的彩排中，一名小丑正在表演。
The performers for the opening ceremonies, going through a full dress rehearsal on Wednesday night.
星期二晚上，开幕式的演员进行了一次完整的带妆彩排。
And his pursuit of ballistic missiles was a kind of dress rehearsal for today’s Iranian nuclear brinkmanship — complete with a covert Israeli campaign to undermine his weapons programs.
而他对弹道导弹的最求，更像是现如今伊朗核计划的彩排。最终以色列的秘密行动葬送了他的武器计划。

Hundreds of dancers and singers, many of them dressed in traditional costumes, strutted behind a marching band to Johannesburg's Soccer City stadium for the dress rehearsal of Friday's World Cup opening ceremony.

Last summer, Du adds, the city conducted a dress rehearsal for the Olympic Games.
NPR: Beijing Races to Clear Its Skies Before the Olympics
At 3:30 on a steamy afternoon in Hollywood, dress rehearsal for American Idol is running into messy overtime.
FORBES: Magazine Article
The terrifying thing is that I suspect this is just the dress rehearsal for an even nastier era to come.
FORBES: Virtual Violence

the last time a theatre work is practised before the real performance, when it is performed with the clothes, stage, and lighting exactly as they will be for the real performance

The dress rehearsal of a play, opera, or show is the final rehearsal before it is performed, in which the performers wear their costumes and the lights and scenery are all used as they will be in the performance.
You can describe an event as a dress rehearsal for a later, more important event when it indicates how the later event will be.