bookend

bookend
noun

a support placed at the end of a row of books to keep them upright, typically ornamental and forming one of a pair
书挡，书立

verb

[with obj.](一般作 be bookended)(informal)occur or be positioned at the end or on either side of (something)
(非正式)放在末尾（或两端）
the narrative is bookended by a pair of incisive essays.
这篇叙述文头尾部分都有深刻的短论。