to ensure; to guarantee; to safeguard

roadblock; barricade

learning difficulties (handicap); retarded

barrier

handicapped

to surmount obstacles; assault course for training troops

cataract (ophthalmology)

to block; to hinder; to obstruct

karmic hindrance (Buddhism); karmic consequences that stand in the way of enlightenment; (term of abuse, especially toward the younger generation) devil spawn; (fig.) money

hearing impairment

evil creature

mental disorder (abbr. for 精神障礙|精神障碍[jing1 shen2 zhang4 ai4]) (Tw)

visual impairment

(of a robot, autonomous vehicle etc) to avoid obstacles

Mara (the demon of temptation)

single point of failure

technical breakdown; malfunction

social security

quality assurance (QA)

blood brain barrier