They commenced a systematic search.

他们开始了系统的搜查。

《柯林斯英汉双解大词典》

A systematic search for randomized controlled trials and prospective cohort studies comparing home-based and clinic-based medical abortion was conducted.

对比较在家里或在诊所进行药物流产的随机对照试验和前瞻性群组研究进行系统搜索。

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The problem cries out for a long-term, open-minded, systematic search, with nature as the only arbiter of what is or is not likely.

这个问题需要人们长期地、不带偏见地、系统地去探索，而只有大自然才是什么可能、什么不可能的唯一仲裁者。

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"We were preparing for a long, systematic search of thousands of globular clusters with the hope of finding just one black hole, " said Dr Maccarone.

BBC: NEWS | Science/Nature | Black hole found in ancient lair

Earlier on Sunday he said that 10 specialist police teams were "continuing to conduct a systematic and methodical search in and around the town".

BBC: April Jones: 100 police in hunt for missing girl

The Montgomery County Sheriff's Office said detectives began a "systematic canvas and search" of areas near the shooting scene and spied the car at the apartment complex.

CNN: STORY HIGHLIGHTS