名詞 preamble:

1. a preliminary introduction to a statute or constitution (usually explaining its purpose)

動詞 preamble:

1. make a preliminary introduction, usually to a formal document

1. He spoke without preamble.
   他沒有開場白地講起來。
2. He launched into his statement without any preamble.
   他開門見山地發(fā)表言論。

pre.am.ble

n.（名詞）
A preliminary statement, especially the introduction to a formal document that serves to explain its purpose.
序言：預(yù)先陳述，尤指對正式文中的介紹，用以解釋其目的
An introductory occurrence or fact; a preliminary.
開端：預(yù)兆性事件或事實(shí)；開端

來源：
Middle English
中古英語
from Old French preambule
源自 古法語 preambule
from Medieval Latin preambulum
源自 中世紀(jì)拉丁語 preambulum
from neuter of praeambulus [walking in front]
源自 praeambulus的中性詞 [在前面行走]
prae- [pre-]
prae- [前綴，表.先于….]
ambul3re [to walk] * see ambulate
ambul3re [行走] *參見 ambulate

【引伸】
pream.bular.y