挖掘过程中经暴露在空气中后，油漆下的涂层开始脱落。
After being exposed to air during digging, the coating under the paint began to fall off.
教授：黄金暴露在空气中会如何？
Professor: What happens to gold when it is exposed to the air?
但是电解液会挥发，因此当这种肌肉暴露在空气中时就会干涸。
But the electrolyte can evaporate, causing the muscle to dry out when exposed to the air.
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