fulfill 来自 full（满的）+ fill（填充）。核心是「把应该满的东西填到满」——承诺（fulfill a promise）达到了当初许下的状态；职责（fulfill a duty）完整执行了；潜力（fulfill one's potential）达到了最大值；梦想（fulfill a dream）实现了。所有义项都是「让某个空缺/亏欠填满」。
释义
1
v.履行，实现（承诺、职责、目标）
The government has yet to fulfill its promise of affordable housing.
政府尚未兑现提供可负担住房的承诺。
2
v.满足（需求、条件、标准）
Applicants must fulfill all the requirements to be considered.
申请人必须满足所有要求才能被考虑。
3
v.使满足感，使实现潜力（fulfill oneself）
She finally found a career that fulfilled her creatively.