【用法】1.表示“人”或“人们”，只用单数形式，但表示复数意义；作主语时谓语用复数。2.表示“民族”时，为可数名词，其前可用不定冠词，也可有复数形式：the peoples of the world 世界各国人民
percent[???????] n.百分之?：The price was reduced by 18 per cent. 价格降低了百分之十八。
perfect[????????] adj.极好的，完美的：None of us are perfect. 我们谁也不是完人。 【注意】本身含有“极”、“最”之义，通常不用于比较等级，也不受very修饰。 perform[???????] v.做，实行，执行；表演：The doctors are performing an operation. 医生们在做手术。/ The children performed a play. 孩子们演了一出戏。
perhaps[???????] adv.可能，也许，或许：Perhaps they like you better than me.也许比起我来他们更喜欢你呢。
period[????????] n.[C]时期，时代；一节(课)：This was the most difficult period of his life. 这是他一生中最艰难的时期。
permit[??????] v.许可，允许 n.[C]许可证，执照：Write me when time permits. 有时间请写信给我。/ Have you got a permit to fish in this lake? 你有在这个湖里钓鱼的许可证吗?
【用法】可接动名词作宾语，但不接不定式作宾语：We do not permit smoking here. 不准在此吸烟。不过不定式的复合结构可作其宾语：They permitted her to leave. 他们允许她离开。
person[??????] n. [C]人，个人：You’re looking a different person. 你看起来像换了一个人。/ He will come in person. 他将亲自来。
persuade [????????] v. 说服，劝说：He persuaded his wife to change her mind. 他说服他妻子改变了主意。
【说明】指说服，若说而不服，则用 try to persuade。
pet[???] n.[C]宠物：She has two cats as pets. 她养了两只猫，把它们当做宠物。 photo / photograph[???????][???????????]n. [C]照片：I’ll have a photo taken. 我要请人拍个照。/ I took a lot of photos during my holiday. 我在度假期间拍了许多照片。
【比较】take a photo与have a photo taken：前者指“(自己)拍照”，后者指“请人拍照”。 physics[???????] n.[U]物理学：Physics studies mechanics, heat, light, sound and electricity. 物理学研究力学、热学、光学、声学和电学。
piano[???????] n. [C,U]钢琴：I can’t play the piano, but I can play the guitar. 我不会弹钢琴，但会弹吉他。
pick[???] v.摘，挑选，扒窃：They were picking cotton. 他们在采棉花。/ Pick out the books that you’d like to read. 挑出你要读的书。/ My pocket was picked. 我的口袋被扒了。
【短语】pick out 挑选；找出 / pick up 拿起，捡起；收拾，整理；学会；(用车)来接，去取；改进，改善；重新开始，继续；感染(疾病、坏习惯等)
picnic[???????] v.(picnicked, picnicked) 野餐n.[C]野餐：The children picnicked in the woods. 孩子们在树林里野餐了。
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picture[???????] n. [C]图画，图片；照片；影片：There are a few pictures on the wall. 墙上有几张画。/ I often go to the pictures on Sunday. 我星期天常去看电影。 pie[???] n. [C]馅饼：fruit pies 水果馅饼 / Have some more pie. 再吃点馅饼吧。 piece[????] n. [C]一起(张，片，件?)：Here are two pieces of advice. 这是两条建议。/ He tore the letter into pieces. 他把那封信撕得粉碎。
pig[???] n. [C]猪：He keeps [raises] 20 pigs. 他养了20头猪。
pile[????] n. [C]堆 v.堆放：Next to it stood a pile of paper cups. 它旁边有一堆纸杯。/ He piled books on his desk. 他把书堆放在书桌上。
pillow[??????] n. [C]枕头：He used his boots for a pillow. 他用靴子作枕头。 pilot[???????] n. [C]飞行员：Michael was the first pilot to fly the plane round the world. 麦克是第一个驾驶飞机作环球飞行的飞行员。
pin[???] n. [C]大头针，别针 v.别住，钉住：pin papers together 把文件用针钉在一起 / drawing pin图钉
pink[????] adj.粉红色的 n. [U]粉红色：The combination of red and white forms pink. 红色和白色混合即成为粉红色。
pioneer[?????????] n.[C]先锋，开拓者：the Young Pioneers 少年先锋队 pipe[????] n. [C]管子，输送管；烟斗：Does he smoke a pipe? 他抽烟斗吗? pity[?????] n.[U]同情 [C]可惜的事，遗憾的事 vt.同情；可怜：Do have [take] pity on me. 千万要可怜可怜我。/ It’s a pity that he can’t come. 他不能来真是遗憾。 place[?????] n.[C]地方，地点；住所；座位；空地；名次v.放，安置：That would be a nice place for a picnic. 这是野餐的好地方。/ Go back to your place. 回到你的座位上去。/ He placed the books on the desk. 他把书放在桌上。
【短语】take place 发生 / take the place of 代替，接替 / change places 换座位 / in place of 代替
plain[?????] adj.坦白的，平易的；朴素的 n. [C]平原，旷野：From the hill top we could see the plains below. 从山顶我们可以看到下方的平原。
plan[????] n.& v.计划：Everyone made plans for going abroad. 每个人都制定了出国计划。/ Do you plan to stay [on staying] here? 你打算留在这里吗?
plane[?????] / aeroplane[??????????] n.[C]飞机：Are you going by train or by plane? 你坐火车去还是坐飞机去?
plant[??????] n.[C]植物 vt.种植，播种：Trees and vegetables are plants. 树和蔬菜是植物。/ April is the time to plant. 4月是种植的时候。
plastic[????????] adj.塑料的n.[C,U]塑料：The company sells plastic products. 这家公司出售塑料制品。
【用法】作名词时，可数或不可数均可，但可数时，通常用复数：Plastic is [Plastics are] sometimes used instead of wood and metal. 塑料有时被用来代替木材和金属。 plate[?????] n.[C]盘子，碟子(比dish浅，扁平)：I almost dropped the plate. 我差点把碟子掉了。
