dumb card

例句：

1. 1.The silent card was a gift from her grandmother.
   这张沉默的卡片是她的祖母送的礼物。
2. 2. She used the dumb card to communicate with her friends through text messages.
   她使用沉默的卡片通过短信与朋友交流。
3. 3. The dumb card helped them to stay focused during the presentation.
   沉默的卡片帮助他们在演讲时保持专注。