The chemical investigation resulted in the isolation of 63 compounds, and the structures were determined based on the modern spectral technology.

采用现代技术分离黄瑞香、陕甘瑞香和结香中的化学成分，鉴定了63个（次） 单体化合物的结构。

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The investigation, he wrote, had been challenging because there were very few research labs able to test for the chemical later identified as the cause of the smell.

他在信中写道，检查遇到了困难，原因是，对于经调查确认造成这种气味的化学物，几乎没有实验室能够测试得出来。

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Method: Density investigation: stick catch; Chemical methods: applying high effect cockroach bait.

方法：密度调查采用粘捕法，化学防制采用高效灭蟑毒饵。

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In the latest development, U.S.authorities are launching an investigation into the presence of the toxic chemical cadmium in children's jewelry imported from China.

VOA: standard.2010.01.11

Engler, of New Jersey, to be a Member of the Chemical Safety and Hazard Investigation Board for a term of five years, vice William E.

WHITEHOUSE: Presidential Nominations Sent to the Senate

He said pressure on the Assad regime has been an obstacle to a fair U.N. investigation of the use of chemical weapons.

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But before Washington acts, the president has said there needs to be a thorough, "prudent" investigation to determine who got chemical munitions and how they got them, when they were used and how they were used.

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