副词是sightlessly，中文意思是adv，看不见地

With a sigh， she returned her gaze to the nearer landscape， and stared sightlessly at the newly emerged tender silver-green leaves on the sagebrush lining the railroad.

叹了口气，她把目光移到近些的风景来，茫然地盯着沿着铁路边的山艾树上新近冒出的银青色的叶子。