1. Would the man's perfidy never reach a limit? 这个人的背信弃义难道永远没有止境吗？
2. The suspicions of British perfidy were bad enough. 美国人怀疑英国人背信弃义，这已经足够糟糕了。
3. As devotion unites lovers, so perfidy estranges friends. 投入使得爱人更亲密，背信能疏远朋友。
4. His return spurred talk of perfidy by the Saudis, whose vast wealth and history of meddling across their south-western border has long stoked Yemeni suspicions. 他的回国激起了沙特人的愤慨，说他背信弃义。该国巨大的财富和在其西南部边界地区跨境干预的历史长期以来让也门人疑虑重重。
