And it turns out it's actually quite flammable. A hydrogen flame is very, very hot, but invisible.

而且，事实表明，氢气非常易燃，氢火焰极为炽热，但却是无形的。

youdao

Apart from being a good thermal and acoustic insulator, it is also non-flammable - a crucial factor for materials used in high heat environments common in the oil and gas industries.

除了是良好的隔音隔热材料，它也是不易燃材料，这对于石油天然气行业高热环境下的应用，是非常关键的因素。

youdao

Yet even if either side (or both) is overstating the case, the Caucasus is too flammable a place to be ignored.

ECONOMIST: Tension grows over Abkhazia

The police watchdog is investigating whether a Taser electric stun gun ignited a flammable liquid which caused a man to be fatally burned.

BBC: Andrew Pimlott

DeGeorge told officials he suspected the explosion was caused either by "hit men" working for the opposite side in a hotly disputed case he was litigating--a "suspicious-looking fishing boat" had circled his yacht, he said--or by the negligence of a repairman who left flammable material near a stove.

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