unable

形容词 unable:

1. (usually followed by `to') not having the necessary means or skill or know-how
2. (usually followed by `to') lacking necessary physical or mental ability
3. lacking in power or forcefulness
   同义词：ineffective, ineffectual

1. The Finance Director sends her apology and is unable to attend the meeting.
   财务董事派人带话说，她因不能出席会议而向大家道歉。
2. The interruption of electricity made us unable to do anything.
   电力的中断让我们什么也不能做。
3. I'm stuck on (ie unable to answer) the second question.
   我在第二个问题上卡住了(不会回答).
4. A little baby is unable to walk or talk.
   婴儿既不会走也不会说。
5. We are as yet unable to say when the train will arrive.
   我们还说不上火车什么时候到达。
6. I am unable to cycle to school because my bicycle is broken.
   我不能骑车上学，因为我的自行车坏了。