pessimistic
pessimistic/ˌpesiˈmistik/adj.悲观(主义)的(［反］optimistic): Cheer up. Don’t be so pessimistic.振作起来，不要太悲观。There’s no reason to be pessimistic about/of the future.没有···
pest/pesticide
pest/pest/n.［c］1.害虫：garden pests园中害虫；get rid of the four pests除四害Flies and mosquitoes are pests.苍蝇和蚊子是害虫。2.讨厌的人，害人虫：a pest of society社会上的害人虫Th···
pester
pester/ˈpestə/vt.使烦恼，纠缠：She constantly pestered him with telephone calls.她老打电话纠缠他。The little girl pestered the travellers for money.那个小女孩缠着游客要钱。We wer···
pet
pet/pet/n.［c］1.宠物：a pet shop宠物商店；an indoor pet室内豢养的宠物He keeps a monkey as a pet.他养了只猴子当作宠物。2.宠儿，宝贝：the teacher’s pet得意门生；make a pet of a chi···
petal
petal/ˈpetl/n.［c］花瓣：rosepetals玫瑰花瓣；flowers with pink and whitepetals带分红的和白的花瓣的花朵There are some drifting petals in that river.在那条河里有许多漂流的花瓣。
petition/petitioner
petition/piˈtiʃən/ I.n.［c］请愿书，申请书，诉状：The petition for a new traffic light have 500 names.要求安装交通灯的请愿书上有500人签名。‖II.vi.&vt.(向…)请愿，正式请求：···
petrochemical
petrochemical/ˌpetrəuˈkemikəl/adj.石油化学的：the petrochemical industry石油化学工业；a huge petrochemical works producing plastics生产塑料的大型石化工厂
petrol/petroleum
petrol/ˈpetrəl/n.［u］(BrE.)汽油(AmE.= gas, gasoline): a petrol station加油站；fill the car up with petrol给汽车加油petroleum/piˈtrəuljəm/n.［u］石油：the petroleum industry石···
petty
petty/ˈpeti/adj.1.小的，琐碎的，不重要的：petty cash (以备收支的)小额现金，零用金；a petty official小官吏；petty troubles (details)小毛病(琐碎细节) 2.气量小的，心胸狭窄的：petty m···
