You must carry your identity card at all times in public.

在公共场合你必须随时携带身份证。

同一单元的其他句子

• The identity card contains your name, photo, and unique number.身份证包含你的姓名、照片和唯一编号。
• How did you obtain your new identity card?你是如何获得新身份证的？
• Don't lose your identity card because replacing it is difficult.不要丢失身份证，因为补办很困难。
• The police officer asked to see my identity card.警察要求查看我的身份证。
• Your identity card is valid for ten years before renewal.你的身份证有效期为十年，之后需要更新。