He wears sweatbands during workouts to prevent sweat from running into his eyes.

sweatbands 是复合名词，由 sweat（汗水）和 bands（带子）组成。sweat 指"汗水"，bands 指"带状物"。 sweatbands 指运动时戴在手腕或额头上的吸汗带，用于吸收汗水防止其流到眼睛或影响握持器械。