portion

n. /ˈpɔːrʃn/ B2

一部分；一份（食物）

A part or share of a whole.

仙境例句

Bit by bit the Cat vanished, until only one portion of it was left: the grin.

那只猫一点一点地消失了，最后只剩下一部分——那张笑脸。