1. Stand back to back! 
   背靠背站好！
2. Back to Back L/C 
   背对背信用证
3. be tracked back to 
   追溯到
4. Back-to-back performances; back-to-back home runs. 
   连续的演出；连续的本垒打
5. Back-to-back letter of credit 
   背对背信用证

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