Environmental investigations have found very high concentrations of lead both outside and inside peoples' homes.

通过环境调查发现，人们的家里家外都具有很高的铅浓度。

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He was offered a scholarship, completed a degree, and has returned to lead anti-poaching investigations in the field.

后来他拿到一份哈佛大学的奖学金，读完学位后又回到野外进行反偷猎的调查。

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He says ongoing investigations may lead to a better understanding of Ebola viruses.

他说持续的研究会使得我们对于伊波拉病毒有更深入的了解。

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Late Friday, Attorney General Eric Holder said he had assigned two U.S. attorneys to lead investigations into the possible leaking of state secrets.

CNN: Obama, GOP and economic blame game

Previously, a GMP spokesman had said Lancashire Police was taking the lead in all investigations around the alleged historical abuse claims, with the Greater Manchester force providing support.

BBC: Sir Cyril Smith abuse claims: Police forces split cases

In the Senate, Kerry has taken the lead on several investigations, including probes of banking scandals and an examination on whether there were any Americans being held as prisoners of war in Vietnam.

CNN: Specials