一卡通 yī kǎ tōng: Beijing's metro card 
方便 fāng biàn: convenient 
不好意思 bù hǎo yì si: Excuse me, could you (may I)… 
借 jiè: lend 
零钱 líng qián: small changes 
车票 chē piào: bus ticket 
损坏 sǔn huài: damage, 
更换 gēng huàn: replace 
地铁 dì tiě: subway; underground railway 
退还 tuì huán: refund 
余额 yú é: balance; remaining fund 
原来如此 yuán lái rú cǐ: I see; so, that's how it is 
万一 wàn yī: what if 
丢失 diū shī: lose 
不记名的 bú jì míng: unregistered 
申请 shēn qǐng: apply for 
中途 zhōng tú: on the way 
倒车 dǎo chē: change buses 
来回 lái huí: go to a place and come back 
足够 zú gòu: enough 

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(China.org.cn)