详细解释:n. 无能, 无力
词意辨析：
disability, inability这一对词都表示“无能”之意，但涵义有细微的差异。
disability: 着重表示“因受伤而变残废所引起的无能”（lacking ability caused by injury）或“因天生的缺陷而导致的无能”（inherent defect）；用于法律方面，它表示“不够资格”、“不合格”（legal disqualification）之意。he has a disability pension because he lost his legs while he was in the army.
他领取伤残抚恤金，因为他在军队服役时失去了双腿。he was always cheerful in spite of his disability.
他虽然有残疾，但心情一直很愉快。
inability: 着重表示“缺少能力”或“缺乏手段”（lack of power or means）的意味。his inability to undertake the work is due to his physical disabilities.
他没有能力承担该工作，是由于他的残疾。can you account for your inability to pay the debt?
您能否解释无法偿债的原因吗？英语解释：
名词 inability:
lack of ability (especially mental ability) to do somethinglacking the power to perform同义词：unfitness