有时候三全音的一个或两个音调会一起从音阶中被忽略，这样就创造出了六音阶或五音阶。
Sometimes one or both notes of the tritone will be omitted from the scale altogether, which creates a hexatonic or pentatonic scale.
CM是一个以梯型相体及气孔结构的三分频全音域系统，它装配了一个10吋低音喇叭、一个4吋中音喇叭，采用一个1吋圆锥形高音单元。
The PA-310 CM is 3-way full-range system in a vented trapezoidal enclosure featuring one 10 "woofers, a 4" horn loaded MF, equipped with one 1 "cone tweeter."
CM是一个以梯型相体及气孔结构的三分频全音域系统，它装配了一个10吋低音喇叭、一个4吋中音喇叭，采用一个1吋圆锥形高音单元。
The PA-310 CM is 3-way full-range system in a vented trapezoidal enclosure featuring one 10 "woofers, a 4" horn loaded MF, equipped with one 1 "cone tweeter."
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