世界卫生专家说，向民众宣导二手烟的祸害，在非洲还是不容易。二手烟包含危险物质，例如焦油、苯和一氧化碳等。

Global public health experts say it remains a challenge to educate Africans about the risks of secondhand smoke, which contains dangerous compounds like tar, benzene and carbon monoxide.

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例如，克雷格·文特尔(Craig Venter)的合成基因学说，以及其他一些公司正在试图开发把碳、页岩焦油和原油变为甲烷的微生物。

For instance, Craig Venter's Synthetic Genomics and other companies are trying to develop microbes that turn coal, tar shale and oil into methane.

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但是机器不能表现人类吸烟的真正方式——例如，吸烟者经常吸更多的“低焦油”香烟来获得相同的体验。

But machines don't reflect the way real people smoke - smokers often puff harder on "low-tar" cigarettes to get the same experience of smoking, for example.

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