这支球队被公认为是一级联赛中的顶级队伍。

This team is recognized as a ___tier-one squad in the league.

这支球队今年成功晋级为一级俱乐部。

The team was promoted to a ___tier-one club this year.

银行将客户数据和核心交易系统列为一级防护对象。

The bank classified customer data and core transaction systems as ___tier-one protection targets.