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promulgate[promulgate 词源字典]

promulgate: [16] Promulgate owes its existence to an analogy drawn by the Romans between ‘milking’ and ‘bringing out into the light of day’. The Latin verb for ‘milk’ was mulgēre (source of English emulsion). It was used metaphorically for ‘cause to emerge’, and combination with the prefix prō- ‘forth, out’ produced prōmulgāre ‘make known publicly, publish’ – whence English promulgate.
=> emulsion[promulgate etymology, promulgate origin, 英语词源]