一定要把邮票在信封上粘牢.Make sure the stamp is properly glued to the envelop.棉织品有良好的粘结性能,任何一种粘结剂均可达到粘牢的效果.Cotton fabrics have good adhesion any binder can achieve unstuck....

“粘牢”的英语可以翻译为：cement ...