overtures

名词 overture:

1. orchestral music played at the beginning of an opera or oratorio
   同义词：overture
2. something that serves as a preceding event or introduces what follows
   同义词：preliminary, overture, prelude
3. a tentative suggestion designed to elicit the reactions of others
   同义词：overture, advance, approach, feeler

1. The audience must be in their seats before the overture.
   观众必须于序曲演奏前入座。