the murderer was ferreted out
find or discover by diligent searching找出；探出；搜出 *The murderer was ferreted out．凶手被查获了。 *John ferreted out the answer to the question in the library．约翰在图书馆找到了问题的答案。 .
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the murderer was ferreted out
凶手被抓了出来
以上为机器翻译结果，长、整句建议使用 人工翻译 。