61.regulate['rɛɡjulet]vt. 管理，调节例句：People sweat to regulate their body heat. 人出汗以调节体温。
62.portion ['pɔrʃn] n. 一部分v. 把...分成多份例句：The front portion of the rocket breaks off. 火箭的前部脱落了。
63.poverty ['pɑvə(r)tɪ] n. 贫穷例句：Millions of elderly people live in poverty.数百万老年人生活在贫困之中。
64.precaution [prɪ'kɔːʃn] n. 预防措施，防备，警惕例句：Vets took precautions to prevent the spread of the disease. 兽医们为防止疾病蔓延采取了预防措施。
65.prescribe [prɪ'skraɪb] vt. 开药，吩咐采用...疗法例句：If these don’t work I may have to prescribe you something stronger. 如果这些药无效，我也许得给你开一些药效更强的。
66.preserve [prɪ'zɜrv] v. 保护，保存，保持，维持例句：the responsibility of the police to preserve the peace 警察维护和平的职责
67.presumably [prɪ'zuːməblɪ] adv. 大概，可能例句：It’s raining, which presumably means that your football match will be cancelled. 下雨了，这可能意味着你们的足球比赛要取消。
68.prevail [prɪ'veɪl] vi. 流行，盛行例句：Different doctrines prevail in different times. 不同时期流行不同的学说。
69.prevailing[prɪ'veɪlɪŋ] adj. 流行的例句：She wears a fashionable hair style prevailing in the city. 她的发型是这个城市流行的款式。
70.previous ['priːvɪəs] adj. 先，前，以前的例句：She has two children from a previous marriage. 她在前一次婚姻中生了两个孩子。
