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.
因为暴露在空气中，所以在糖浆的表面，形成了一层薄膜。
Because a thin film has formed on the surface of the syrup due to its exposure to 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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