se-是拉丁语源的介副词性质的原生词缀，它只出现在拉丁动词词根前面，其意思相当于aside，apart或away，即表亦“相离”之意。sed-是se-的异体，用在元音字母之前，在英语中极为少见。
下面介绍6个常见的带se-的原生词。
secede [ se- = apart 离;ced = to go 走；-e=>“to go apart 离开”→] v. withdraw formally from an organization 退出；脱离 / The Confederacy was composed of southern states that seceded from the Union. 南部联邦是由脱离合众国的南方各州组成的。
secession n. 退出；脱离
secure [ se- = apart 离开；cur = care 烦恼；-e=>“apart or free from care 离开烦恼的境地”→] I a. safe against loss, attack, or danger 安全的，安心的，保险的 / This is a secure hiding place. 这是一个安全的藏身之地。II vt. make safe; protect使安全；保卫 / You can secure yourself against all dangers. 你可以使自己免受一切危险。
security n. 安全，安全感；保证；担保
seduce [se- = aside 离偏；due = to lead 引导；-e=>“to lead sb. aside 将某人引偏了 ”→] vt. lead astray; persuade to do wrong 引诱；诱使…堕落 / He was seduced by the offer of big money and joined the conspiracy. 他被人家的重金许诺所诱惑，参与了阴谋活动。
seduction n. 诱惑；勾引；诱奸
seductive a. 诱惑的；诱人堕落的
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