Reading this property returns the current vertical offset.
读取此属性将返回当前垂直偏移。
The current vertical type maintenance gap adopted leads to lower maintenance effectiveness.
但实际中却采用垂直“天窗”，使得维修效率低下。
The current vertical type maintenance gap adopted leads to lower maintenance effectiveness.
但实际中却采用垂直“天窗”，使得维修效率低下。
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