舞台上挂着一块大幕。
wǔtái shàng guà zháo yīkuài dà mù 。
There is a big screen hanging on the stage.
电影开始前，幕布缓缓落下。
diànyǐng kāishǐ qián ， mù bù huǎnhuǎn làxià 。
Before the movie starts, the curtain slowly comes down.
他在幕前演讲，大家都在认真听。
tāzài mù qián yǎnjiǎng ， dàjiā dūzài rènzhēn tīng 。
He is giving a speech in front of the screen, and everyone is listening attentively.