物质暴露于空气中，通过机械作用或化学反应使其纯化。
The purification of a substance by exposure to the mechanical or chemical action of air.
当乙醇暴露于空气中受醋酸细菌的作用时便变成醋酸和水。
When ethanol is exposed to air and the action of vinegar bacteria, it is converted into acetic acid and water.
从暴露于空气中但被遮挡不受直接太阳幅射的温度表上读出的温度。
Temperature read on a thermometer which is exposed to the air in a position sheltered from direct solar radiation.
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