The contents and distribution of Pb, Cd and As in 497 flue-cured and 17 burley tobacco leaf samples collected from major tobacco production regions of China in 2004 were studied.

研究了我国烟叶主产区2004年生产的497份烤烟样品和17份白肋烟样品中铅、镉、砷的含量及分布特征。

youdao

Cigarette sales surged again with the introduction of the "White Burley" tobacco leaf and the invention of the first practical cigarette-making machine, sponsored by tobacco baron James Buchanan "Buck" Duke, in the late 1880s.

CNN: A brief history of tobacco