So she formed the group and declared November 11 as "Twins Day" to encourage parents of twins to share experiences and help each other out.
為了提供更積極的服務，張特別成立了「雙胞胎父母聯誼會」；並訂每年的十一月十一日為「雙胞胎日」，希望大家分享彼此的經驗和相互支持。