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I emptied out my pockets but could not find my keys.

我把口袋里的东西都掏了出来，仍然找不到我的钥匙。

《牛津词典》

Despite her earnest efforts, she could not find a job.

尽管她已尽心竭力，但是仍然找不到工作。

《牛津词典》

She said Ian Shaw was among several people who could not find paying jobs but still wanted to work.

VOA: special.2009.04.03

If you look really carefully, you could find it was not a single line but two lines, and Bohr is silent on such matters.

如果你仔细观察的话，会发现这是两条谱线而非一条，对这一研究，波尔不得不沉默。

麻省理工公开课 - 固态化学导论课程节选

"Germont and his policemen could not find the letter, because they did not try to understand the mind of the man who stole it.

VOA: special.2009.12.26

By the time paramedics rushed the 32-year-old to the hospital, doctors could not find a pulse.

CNN: SHARE THIS

Children's Services in Peterborough said it could not find a record of Ms Johnson's call.

BBC: Care team's failure to save Tyler Whelan

Ridgeley said NHF could not find a source willing to issue such a bond.

FORBES: Magazine Article