衍yǎn[书] Ⅰ (开展； 发挥) spread out; develop; amplify Ⅱ （多余） redundant; superfluous Ⅲ ❶ （低而平坦的土地） low and smooth land; low-lying flatland: 广 ～ 沃野 a broad expanse of fertile flatland
❷ （山坡） hillside
❸ （沼泽） marsh; swamp; bog
◆衍变 develop; evolve; 衍射 {物} diffraction; inflection; 衍生 {化} derive; 衍生物 {化} derivative; derivant; derivate; ramification |