前者如温度湿度、太阳辐射热及大气中CO_2的作用，不管所处的环境如何，这是任何混凝土都不可避免要遭受的劣化因子；
There is common destroy gene, such as the effect of temperature, humidity, the radiant heat of the sun and CO_2 in the air, it is inescapability to any concrete structure.
前者如温度湿度、太阳辐射热及大气中CO_2的作用，不管所处的环境如何，这是任何混凝土都不可避免要遭受的劣化因子；
There is common destroy gene, such as the effect of temperature, humidity, the radiant heat of the sun and CO_2 in the air, it is inescapability to any concrete structure.
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