1·Helium is far lighter than air and is inert, which means it won't combust when you combine it with air and energy, like Hydrogen does (below).
氦气比空气轻得多并且是惰性气体，这意味着，当它与空气和明火接触不会燃烧，而氢气却会(请看下图)。
2·Such tiny particles combust more rapidly than larger particles to give an additional kick, and may allow easier control over a rocket's thrust.
这样的微小颗粒比大颗粒燃烧的更迅速，从而能提供额外的推进力，并可以更加容易控制火箭的推进。
3·Did you just combust? Because you're HOT!
你刚刚在燃烧？因为你好火辣！
4·In matters of secrecy, let not the Moon be combust, but going from combustion.
关于秘密的事情，不要让月亮被燃烧，而是从燃烧远离。
5·The vegetation on the ground heats up enough to release gas, but some of the gas can't combust, because it doesn't have enough oxygen around it.
地面植被加热到一定程度会释放出气体，但其中有些气体是不能燃烧，因为它们周围没有足够的氧。