短语词组短语back -to credit 翻译Back to back charter 转租合同;转租合约back to back L 对背信用证;背对背信用证Back to Back Homerun 连续两棒击出全垒打back to back tug 拉背back to back connection 背对背连接;背向接线;交叉连接Stand back to back 背靠背站着 返回 back to back