将木板进行结合及渗透处理，形成结实、保护性强的能阻挡渗水防护层，从而减少开裂及紫外线降解。
The treatment bonds and penetrates the timber to form a tough, protective barrier that resists water penetration, thus reducing cracking and UV degradation.
关于紫外线辐射使聚合物降解的原理，专家们是有分歧的。
The mechanism of polymer degradation by ultraviolet radiations is not agreed upon by experts.
但也存在某些不足，如改性沥青加工过程中的温度老化、贮存稳定性及在紫外线作用下降解加速材料老化等问题。
However, some drawbacks exist, such as high temperature agi ng in process of modification, low storage stability and degradation acceleration under ultraviolet.
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