In the constructor (see Listing 5), initialize the parent class using the $orientation (page orientation), $unit (measurement unit), and $format (page size) that were passed in.

在构造函数（请参考 清单 5）中，使用传入的 $orientation（页面方向）、$unit（计量单位）和 $format（页面大小）初始化父类。

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Plus, with in-built Orientation Sensors, the main unit can detect horizontal or wall mounted (vertical) placement and initiate Smart Equalisation to optimise sound performance.

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