来源于拉丁语，是sui的离格，意为“apart,whtour”,sed是它的变形。
1.secede
v.withdraw from membership of a state,federation,organization,etc.脱离，退出;se=apart,词根ced=go
Two factions secede from the party after the controversial vote.
经过具有争议的投票之后，两个派别脱离了那个党。
2.secure
adj,safe 安全的
v.guarantee 保证；使安全；se=apart,cur=care
You might feel more secure in a samller house.
也许在一个较小的房间里你会感到安全。
3.seduce
v.lead astray;persuade somebody less experienced to have sexual intercourse 引向歧途；诱奸；se=apart,duc=lead
Foster used expensive gifts to seduce the 16-year-old girl.
弗斯特用贵重的礼物来诱惑这个16岁的女孩。
4.secrete
v.put or keep in secrete place;produce by secretion 隐秘，隐藏；分泌；se=apart,cret=separtate
Your mouth secretes saliva that starts softening the food before it reaches your stomach.
口腔内分泌的唾液可以使食物在到达胃前就开始软化。