| 摘要 |
A shield is disclosed, comprising a perforated inner sheet-metal layer (3); an outer sheet-metal layer (4), wherein a cavity delimited by the perforated inner sheet-metal layer and the outer sheet-metal layer is defined; and a plurality of metallic hollow bodies (5) in the cavity, wherein the minimum diameter of the hollow bodies is larger than the perforation (2) of the inner sheet-metal layer. |
