市政府正在对老城区的历史建筑进行标志性认定以保护城市风貌。

The government is ___designating historic buildings in the old town to preserve the city's character.

医生在CT扫描中使用了关键点标记技术来定位肿瘤的位置。

The doctor used ___landmarking in the CT scan to locate the tumor position.