价带顶和导带底附近的带间跃迁振子强度大部分都近乎为零；
Most optical oscillator strengths for the transitions between valence band and conduction band are nearly equal to zero.
大多数情况下，排水孔都穿过过滤带和底导规。
Most often the drainage holes run through both the filter belt and the bottom guides.
大多数情况下，排水孔都穿过过滤带和底导规。
Most often the drainage holes run through both the filter belt and the bottom guides.
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