After being exposed to air during digging, the coating under the paint began to fall off.
挖掘过程中经暴露在空气中后，油漆下的涂层开始脱落。
At temperatures high enough to melt it, titanium exposed to air catches fire.
在温度足够高时，与空气接触的熔融钛会着火。
If the fuel is exposed to air, it could degrade further and emit dangerous levels of radioactivity.
如果核燃料扩散到空气中，它能不断分解和扩散，导致空气放射性强度大大增强。
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