hatpin

详细解释:n. 帽针

英语解释：

名词 hatpin:

a long sturdy pin used by women to secure a hat to their hair

详细解释：

hat.pin

n.（名词）
A long straight pin usually with an ornamental head, used to secure a hat to the wearer`s hair.
妇女帽针：一种用来把帽子固定在戴者的头发上，通常带有装饰性的头的长而直的针