preamble

名词 preamble:

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

动词 preamble:

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

1. He spoke without preamble.
   他没有开场白地讲起来。
2. He launched into his statement without any preamble.
   他开门见山地发表言论。

pre.am.ble

n.（名词）
A preliminary statement, especially the introduction to a formal document that serves to explain its purpose.
序言：预先陈述，尤指对正式文中的介绍，用以解释其目的
An introductory occurrence or fact; a preliminary.
开端：预兆性事件或事实；开端

来源：
Middle English
中古英语
from Old French preambule
源自 古法语 preambule
from Medieval Latin preambulum
源自 中世纪拉丁语 preambulum
from neuter of praeambulus [walking in front]
源自 praeambulus的中性词 [在前面行走]
prae- [pre-]
prae- [前缀，表.先于….]
ambul3re [to walk] * see ambulate
ambul3re [行走] *参见 ambulate

【引伸】
pream.bular.y