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. 我媽媽和我姨定期通信已 有多年，每周一封信。

correspondence n. 通信聯(lián)系；互通的信件

president [ presid ( ←preside) v. 主持，作會(huì)議主席；-ent→] n. ①one who presides at a meeting; chairman 會(huì)議主持者，主席/ The vice-president of the United States is president of the Senate. 美國(guó)的副總統(tǒng)是參議院的主席。②the chief officer of a company, college, society, etc.總經(jīng)理，大學(xué)校長(zhǎng)，會(huì)長(zhǎng)等 / He was the president of Columbia University then. 當(dāng)時(shí)他是哥倫比亞大學(xué)校長(zhǎng)。

presidency n. 總統(tǒng)（校長(zhǎng)、會(huì)長(zhǎng)等）職務(wù)或任期

agent [ ag = to do 做；-ent=>“one that does sth. for another 為他人做事者”→]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. 保險(xiǎn)代理商會(huì)替你的財(cái)產(chǎn)辦理保險(xiǎn)以防意外的損失。

agency n. 代理；代理權(quán)；代理處；機(jī)構(gòu)

parent [ per = to bring forth 生（孩子）；-ent=>“one that brings forth offsprings 生產(chǎn)后代者 ] n . a father or mother 父（母） 親/His parents expected him to be a doctor. 父母親希望他將來(lái)當(dāng)醫(yī)生。

parental a. 父母的；父的，母的

corrodent [ corrod ( ← corrode) v. 腐蝕；-ent=>“a thing that corrodes another 腐蝕它物者” →]n. a corrosive agent 腐蝕劑 / Acids are corrodents. 酸是腐蝕劑。

detergent [ de- = away 離；terg = to wipe 消除；-ent=>“a thing that wipes or cleanses dirts 清除污物的東西”→] n. a substance?used for cleansing 洗漆劑 / Detergents, unlike soaps, clean effectively in hard water.跟肥皂不同，洗滌劑在硬水中也能有效地除污。

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