phi cổ bất thành kim

== Vietnamese == === Etymology === Sino-Vietnamese word from 非古不成金. Compare Chinese 無古不成今／无古不成今. === Pronunciation === (Hà Nội) IPA(key): [fi˧˧ ko˧˩ ʔɓət̚˧˦ tʰajŋ̟˨˩ kim˧˧] (Huế) IPA(key): [fɪj˧˧ kow˧˨ ʔɓək̚˦˧˥ tʰɛɲ˦˩ kim˧˧] (Saigon) IPA(key): [fɪj˧˧ kow˨˩˦ ʔɓək̚˦˥ tʰan˨˩ kim˧˧] === Idiom === phi cổ bất thành kim there is no present without the past