She prefaced her remarks by an apology.

她以道歉的话作为开。

The chairman made a few introductory remarks.

议主席说了几句开。

The dean made a few introductory remarks before the lecture.

系主任在讲课前讲了几句开。

He spoke without preamble.

他没有开地讲起来。

The prolusion needs to be designed well, a exquisite and claptrap prolusion can grasp the attention of the audienc immediately and it lays a good foundation for a successful demostration.

开需精心设计，精妙、应景得开能够迅速抓获听众的注意力，为演示成功奠定坚实基础。

The Prologue is all that precedes the Parode of the chorus; an Episode all that comes in between two whole choral songs; the Exode all that follows after the last choral song.

开在合唱队的进歌之前；两首完整的合唱歌曲之间次；退歌紧随最后首和唱歌。