preamble
noun uk/ˈpriː.æm.bəl/ /priˈæm.bəl/ us/ˈpriː.æm.bəl/ /priˈæm.bəl/
[ C ] publishing specialized序论;导言;开场白
an introduction to a speech or piece of writing
[ U ]开场白;（做事的）前奏
something that happens before or leads to something else
The agreement between the warring parties to talk may be a preamble to peace. 交战双方同意对话的举动可能是和平的前兆。