对于公用运输业者运输，要求贴有一个DOT的4英尺x 4英尺的不可燃气体标志或标签。
DOT 4 "x 4" nonflammable gas label or tag is required for common carrier shipments.
Hindenburg号爆炸事件表明采用氢气作为飞艇的填充气非常危险，但新的填充气采用氦气——一种不可燃气体，而不是终止采用飞艇技术。
The explosion of the Hindenburg showed the dangers of hydrogen as a lifting gas and resulted in new emphasis on helium, which is not flammable, rather than ending the reign of rigid airships.
生物质气化是获得尽可能多的可燃气体，但在气化过程中，不可避免地产生了焦油等副产物。
Biomass gasification is to obtain as much as possible of gas fuel. However, gasification process inevitably produces tar and other by-products.
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