optical adj. 光学的;眼的,视觉的 an optical illusion 光幻觉,错觉 optimistic adj. 乐观的,乐观主义的 pessimistic optional adj. 可任意选择的,非强制的 optional subjects at school 学校的选修课 oral adj. 口头的 an oral examination 口试 orbit n. 轨道(天文) v. 绕 的轨道运行 The satellite is orbiting the earth. 卫星正环绕地球运行。 circle orchestra n. 管弦乐队 symphony orchestra 交响乐团 orderly adj. 整齐的,有秩序的 an orderly man 有条理的人 neat ore n. 矿,矿石 organ n. 器官;风琴;机构 organic adj. 器官的;有机的 organic evolution 生物进化 organism n. 生物体,有机体 organization n. 组织;团体,机构 organize vt. 组织,创办 organize an army 编组军队 organize oneself 使自己心里有准备 establish , constitute origin n. 起源,来源 the origin of civilization 文明的起源 source n. 出身 a man of humble origin 出身寒微的人 by origin 论出身 original adj. 最初的,原来的 an original plan 原计划 primary adj. 有独创性的,新颖的 an original mind 独具卓见的人 ounce n. 盎司 outcome n. 结果 result outdoors adv. 在户外,在野外 in the open air outer adj. 外面的,外部的 outer space 宇宙空间 outlet n. 出口,出路;(感情、精力等)发泄途径(或方法) outline n. 提纲,概要;轮廓,略图 vt. 概述 The professor outlined Napoleon s Russian campaign. 教授概述了拿破仑的征俄战役。 outlook n. 景色,风光;观点,见解 a man with a narrow outlook on life 人生观狭窄的人 n. 展望,前景 prospect output n. 产量 yield n. 输出 input outset n. 开始,开端 at the outset 在开始时 start outstanding adj. 突出的,显著的,杰出的 remarkable
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