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plain[plain 词源字典]

plain: [13] Plain is etymologically the same word as plane in all its uses except the tree-name, and even that comes from the same ultimate source. This was Indo-European *plā- ‘flat’, which produced Greek platús ‘broad’ (source of English place, plaice, and platypus), Latin plānus ‘flat, clear’, and possibly English flat. The Latin word passed into English via Old French plain, but its original ‘flat’ senses have been hived off into the separately acquired plane, leaving only the metaphorically derived ‘clear’ senses. The Italian descendant of plānus has given English piano.
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