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There are chemical fuels that are clean and smokeless .

有些化学燃料是清洁无烟的。

Use of smokeless tobacco also raises the risk .

即使吸食低焦油的烟草也同样会提高患病风险。

The spanish soldiers used smokeless gunpowder .

西班牙军队用的是无烟火药。

Tourism is a smokeless industry .

旅游业是一种无烟产业。

The nitramine ethers perform two functions in the smokeless powder composition .

硝胺醚在无烟火药成份中有两种作用。