这是一个由机器和高大的烟囱组成的城镇，从烟囱里冒出的烟永远、永远地蔓延着。
It was a town of machinery and tall chimneys, out of which smoke trailed themselves for ever and ever.
为了加深理解梗丝在卷烟叶组配方中的作用，对比研究了烤烟叶片和烟梗的化学组成以及它们在不同温度下的热裂解产物。
To further understand the effect of tobacco stems in tobacco blend, a detailed comparative study of chemical components of tobacco leaves and stems before and after combustion was carried out.
美国的混合型卷烟是由几种类型的烟草组成的，包括烤烟、白肋烟和香料烟。
The American blend cigarette is composed of several types of tobacco including flue-cured, burley, and Oriental tobacco.
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