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481, precede vt.先于 vi.领先 The days that preceded were filled with activity. 前几天排满了活动。 482, precipitate a.突如其来的 vt.使突然发生 n. 沉淀物 vt. 使发生; 促成 Falling sales precipitated the failure of the company. 销售额下降促使该公司倒闭。 猛然摔下 He lost his footing and was precipitated to the ground. 他失足摔倒在地上。 使沉淀, 使淀析 Water precipitates camphor from its alcoholic solution. 水能把樟脑从其酒精溶液中淀析出来。 vi. 沉淀, 淀析; 凝结 Clouds usually precipitate as rain or snow. 云常会凝结成雨或雪。 n.〈化〉沉淀物; 析出物; 冷凝物 adj. 急促的, 迅猛的 A cool breeze caused a precipitate drop in the temperature. 冷风使温度急降。 未经考虑的, 仓促的 The king was too precipitate in declaring war. 国王在宣战一事上过于轻率。 鲁莽的, 仓促行事的, 感情用事的 483, preclude vt. 预先排除,预防,阻止,妨碍 | 
