correspondent [correspond v. 通信；-ent=>“one that corresponds 通信者”→]n. one who exchanges letters with another 通信者/ My mother and her sister have been regular correspondents for years, writing to each other weekly. 我妈妈和我姨定期通信已 有多年，每周一封信。
correspondence n. 通信联系；互通的信件
president [ presid ( ←preside) v. 主持，作会议主席；-ent→] n. ①one who presides at a meeting; chairman 会议主持者，主席/ The vice-president of the United States is president of the Senate. 美国的副总统是参议院的主席。②the chief officer of a company, college, society, etc.总经理，大学校长，会长等 / He was the president of Columbia University then. 当时他是哥伦比亚大学校长。
presidency n. 总统（校长、会长等）职务或任期
agent [ ag = to do 做；-ent=>“one that does sth. for another 为他人做事者”→]n. a person or company that acts for another 代理人；代理商 / An insurance agent will insure your property against losses from accidents. 保险代理商会替你的财产办理保险以防意外的损失。
agency n. 代理；代理权；代理处；机构
parent [ per = to bring forth 生（孩子）；-ent=>“one that brings forth offsprings 生产后代者 ] n . a father or mother 父（母） 亲/His parents expected him to be a doctor. 父母亲希望他将来当医生。
parental a. 父母的；父的，母的
corrodent [ corrod ( ← corrode) v. 腐蚀；-ent=>“a thing that corrodes another 腐蚀它物者” →]n. a corrosive agent 腐蚀剂 / Acids are corrodents. 酸是腐蚀剂。
detergent [ de- = away 离；terg = to wipe 消除；-ent=>“a thing that wipes or cleanses dirts 清除污物的东西”→] n. a substance used for cleansing 洗漆剂 / Detergents, unlike soaps, clean effectively in hard water.跟肥皂不同，洗涤剂在硬水中也能有效地除污。
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