The researchers' first subject was the tobacco plant.

研究人员第一个研究对象是烟草。

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They infect a tobacco plant with the gene-carrying virus by scratching the virus on its leaves.

通过把这种带有基因的病毒擦到叶子上，来感染烟草。

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While he was exploring the shores of America, he saw the Indians smoking the leaves of the tobacco plant.

他在美洲海岸探险的时候，看到印第安人抽烟草的叶子。

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"Tobacco has killed more people than any other plant I could find.

VOA: special.2009.08.25

The rare leaf is a part of the tobacco plant called the medio tiempo, taken from the upper leaves of the plant, but which not every plant produces, making it rare.

CNN: STORY HIGHLIGHTS

You could get a job at the local tobacco or textile plant and still be able to provide for yourself and your family.

WHITEHOUSE: Education, Innovation & The Economy

Japan Tobacco now has the capacity to make only 70 billion cigarettes a year at its plant in St.

FORBES: Magazine Article