英汉词典

1. 不能…的；无法…的
    If you are unable to do something, it is impossible for you to do it, for example because you do not have the necessary skill or knowledge, or because you do not have enough time or money.

unable是什么意思

    e.g. The military may feel unable to hand over power to a civilian President next year...
           军方可能会觉得明年难以将政权移交给一位民选总统。
    e.g. Unable any longer to keep from breaking in she said, 'I simply cannot believe you're serious.'
           她再也忍不住了，便插话道：“我真不敢相信你是认真的。”