n.（信件或包裹上的）邮戳
He took a used envelope bearing an Irish postmark.
他拿了一个盖着爱尔兰邮戳的旧信封。
All the letters bore an Aberdeen postmark.
所有的信件上都盖有阿伯丁郡的邮戳。
She puzzled over the postmark on the letter.
她想弄明白信封上的邮戳.