To be at the end of one's tether, having exhausted all resources and means; to be in a desperate situation with no options left, like a battle where all arrows are used up and all soldiers are gone.
经过长时间的努力，他感觉自己已经矢尽兵穷，再也想不出新的办法了
After a long period of effort, he felt he had exhausted all his resources and could no longer come up with new ideas.
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