While concentrations varied daily, typical concentrations of lead particles ranged from 0.6 to 1 microgram per cubic meter of air, Bell and her thesis adviser Catherine Cahill found.

Bell和她的论文导师Catherine Cahill发现，尽管浓度含量每天都发生变化，铅浓度含量一般在0.6到1微克每平方米空气之间。

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In 1937 he was seconded to the Royal Canadian air Force in Ottawa as air armament adviser.

1937年他被临时调往渥太华的加拿大皇家空军担任军备顾问。

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That is why, on the unanimous recommendation of my national security team - including the vice president, the secretary of defence, the chairman of the joint chiefs of staff, the secretary of state and the national security adviser - I have ordered a strong, sustained series of air strikes against Iraq.

BBC: Clinton announces Iraq strikes: Full text

When the extra Russian MiGs arrived in Armenia earlier this year, an influential presidential adviser in Azerbaijan, Vafa Guluzade, grandly invited the Americans to set up an air base outside Baku.

ECONOMIST: The Caucasus

Janice Nolen, national policy adviser at the American Lung Association, says that rather than dealing with the harmful effects of air pollution, the focus should be on tackling the problem at source.

CNN: Smog-eating tiles gobble up air pollution