| 主权项 |
1. A shield comprising:
one or more protrusion members having shapes protruding from an outer surface of the shield are provided or, alternatively, one or more recesses having shapes depressed from the outer surface of the shield are carved, wherein the one or more protrusion members or the one or more recesses are located at vicinities of both side positions on the shield where the lateral width of the shield in right and left directions becomes a maximum. |
