401, opaque a.不透明的;不传导的
402, oppress vt.压迫,压制;压抑
403, optimism n.乐观,乐观主义
404, optimum n.最适条件,最适度
405, option n.选择,取舍
406, orient n.东方;亚洲,远东
407, oriental a.东方的;东方国家的
408, orientation n.向东;定位;方向
409, originate vi.发源 vt.首创
410, ornament n.装饰物 vt.装修
411, orthodox a. 正统的,传统的,惯常的
412, outbreak n.爆发
413, oval a.卵形的 n.卵形
414, overflow vt.从中溢出
415, overhear vt.偶然听到;偷听
416, overlap vt.与交搭 vi.重迭
417, overt a. 明显的,公然的
418, overthrow vt.推翻 n.推翻,瓦解
419, overwhelm vt.压倒,使不知所措
420, oxide n.氧化物
421, pamphlet n.小册子
422, panic n.恐慌,惊慌
423, paradise n.伊甸乐园;天堂
424, paradox n. 似非而是的论点,自相矛盾的话
425, paralyze vt. 使瘫痪,使麻痹
426, parameter n.参数;参量
427, participant n.参加者 a.有份的
428, partition n.分开,分割;融墙
429, pastime n.消遣,娱乐
430, pasture n.牧场;牲畜饲养
431, patent a.专利的 n.专利
432, pathetic a.哀婉动人的;可怜的
433, patriotic a.爱国的
434, patrol n.巡逻 n.巡逻,巡查
435, pave vt.铺,筑
436, pearl n.珍珠;珍珠母
437, pedal n.踏脚,踏板,脚蹬
438, pedestrian n.行人,步行者
439, peel vt.剥,削
440, peer vi.凝视;隐约出现
441, penalty n.处罚,刑罚;罚款
442, pendulum n.摆
443, pension n.抚恤金,年金
444, perception n.感觉;概念;理解力
445, perfection n.尽善尽美;无比精确
446, perfume n.香味,芳香;香料
447, periodic n.周期的;一定时期的
448, periodical n.期刊,杂志
449, perish vi.死亡,夭折;枯萎
450, permeate vt. 弥漫,渗透,充满 vi. 透入
451, permissible a. 可允许的
452, perpetual a.永久的;四季开花的
453, perplex vt.迷惑,困惑,难住
454, persistent a. 固执的,坚持的,持续的
455, pest n.害虫;害人虫
456, petition n.请愿 vt.向请愿
457, petty a.细小的;器量小的
458, physiological a. 生理学的,生理学上的
459, plague n.瘟疫,鼠疫;天灾
460, plaster n.灰泥;硬膏;熟石膏
461, plateau n.高原;平稳时期
462, plausible a. 似乎真实的,似乎合理的
463, plea n.请愿,请求,恳求
464, plea n.请愿,请求,恳求
465, plead vt.为辩护 vi.抗辩
466, pledge n.誓言 vt.使发誓
467, poke vt.戳,刺;伸
468, polar a.南极的;极性的
469, poll n.投票 vi.投票
470, ponder vt.考虑 vi.沉思
471, pope n.教皇
472, porch n.门廊,入口处
473, pore n.毛孔,气孔,细孔
474, portray vt. 描绘,描写,描写...的肖像,
475, pose vi.假装,摆姿势 n.姿势
476, poster n. 海报,招贴,脚夫
477, postulate vt.要求,假定,假设
478, practicable a.能实行的;适用的
479, prayer n.祈祷,祈求
480, preach vt.说教,布道;鼓吹
481, precede vt.先于 vi.领先
482, precipitate a.突如其来的 vt.使突然发生 n. 沉淀物
483, preclude vt. 预先排除,预防,阻止,妨碍
484, predecessor n.前辈,前任者
485, predominant a.占优势的;主要的
486, pregnant a.怀孕的;意义深长的
487, premature a. 早熟的,过早的 n. 早产儿
488, premise n. 前提,假设,房产
489, premium n. 额外费用,奖金,奖赏,保险费
490, prescription n.药方,处方的药
491, presentation n.介绍;赠送;呈现
492, preside vi.主持;主奏
493, prestige n.威望,威信,声望
494, presumably ad.推测起来,大概
495, presume vt.假定,假设,揣测
496, pretext n. 借口,托辞
497, prevalent a.流行的;盛行的
498, prey vi.猎物 vi.捕获
499, priest n.教士,牧师,神父
500, priority n.先,前;优先,
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