学校任命了几位老师作为钥匙保管人，负责早晚开关教学楼。

The school appointed several teachers as ___keyholders to open and close the teaching building every day.

银行任命了几名高级员工作为数字货币保险箱的密钥持有人。

The bank appointed several senior staff as ___keyholders for the digital currency vault.