a cloth covering for a service cap with a flap extending over the back of the neck to protect the neck from direct rays of the sun
havelock详细解释
have.lock n.（名词）A cloth covering for a cap, having a flap to cover and protect the back of the neck.遮颈布：军帽的一块有垂布遮盖和保护脖子后部的遮布 来源：After Sir Henry Havelock (795-857), British soldier 源自亨利 哈弗洛克 爵士(795-857年），英国士兵
