由于减反膜自身反射率曲线的波长依赖性和谱线宽度的有限性，故一般情况下镀膜面的实际反射率比减反膜自身的最低反射率高。
Due to the wavelength dependence and finite spectral width of the reflection curve, the reflectivity which takes effect is generally higher than the minimum reflectivity claimed.
各种工况下的渗流溢出点附近相对于整个坝体其它部位更易于发生渗透破坏，故应做好初期坝下游坝坡的反滤保护。
Compared with with other part, the area near overflow point could be more easily destructed. Therefore, the filter protection to the downstream of the primary dam should be done early.
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