Mark：I need to pay a fine. 
我交罚款。

Clerk：Give me your ticket and Mudan card. 
把您的罚单和牡丹卡给我。

Mark：
Mudan card? What Mudan card? 
牡丹卡？什么牡丹卡?

Clerk：The card is specially used to pay for tickets. 
就是专门用来交罚款的那张卡。

Mark：I forgot to take it. 
哦，我忘带了。

Clerk：You can't pay your ticket without the card. 
没有卡，您现在交不了罚款。