Those two friends are as loyal as Damon and Pythias.
这两个朋友如刎颈之交般的忠诚.
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英英释义
Noun
1. (Greek mythology) according to a Greek legend: when Pythias was sentenced to be executed Damon took his place to allow Pythias to get his affairs in order; when Pythias returned in time to save Damon the king was so impressed that he let them both live