作为社交媒体经理，她是公司官方账号的守门人。

As the social media manager, she is the ___gate-keeper of the company's official account.

学术期刊的编辑常被视为新思想的重要把关者。

Editors of academic journals are often seen as key ___gate-keepers for new ideas.

我们的守门员在比赛中扑出了关键的点球。

Our ___gate-keeper blocked a crucial penalty kick during the match.