An outdoor dry transformer having a shield made of a high functional fiber. A second de-duplication scope includes similar information for a second volume. The rack elements are configured to have a plurality of protrusions and recessions so that the protrusions and recessions of a rack element slideably interlock with complementary recessions and protrusions of other-rack elements of generally similar appearance, so that the rack elements may be assembled into a modular rack without the need of tools or external fastening elements. In this case, the sub-band differential information may be denoted by a specific value contained in a differential-value range including only positive values. Next, a window is displayed in response positioning. The surface of the inner wall that is closest to a center point of the arc has an adhesive and the bottom surface of the bottom also has an adhesive.