a warm-up act

• 序幕

a warm-up act的用法和样例：

例句

1. The concert began with a piano solo.
   音乐会以钢琴独奏曲拉开序幕。
2. The curtain was rung up on a new epoch in our history.
   我国历史上一个新纪元的序幕揭开了。