secession
英 [sɪˈseʃn] 美 [sɪˈseʃn]
（地区或集团从所属的国家或上级集团的）退出、脱离
- the Ukraine's secession from the Soviet Union
乌克兰之退出苏联
sedition
英 [sɪˈdɪʃn] 美 [sɪˈdɪʃn]
【正式用语】煽动叛乱的言论（或行动）
- Government officials charged him with sedition.
政府官员指控他煽动人们造反。
secede
英 [sɪˈsiːd] 美 [sɪˈsiːd]
【正式用语】（州、邦、国家等）退出，脱离（组织等）
- Singapore seceded from the Federation of Malaysia and became an independent sovereign state.
新加坡脱离马来西亚联邦成为一个独立的主权国家。
seclude
英 [sɪˈkluːd] 美 [sɪˈkluːd]
【正式用语】（使）与…隔离、与…隔绝；（使）隐居、独处
- Typically, the bride would seclude herself in another room.
一般来说，新娘会把自己关在另一个房间里。
segregate
英 [ˈseɡrɪɡeɪt] 美 [ˈseɡrɪɡeɪt]
隔离并区别对待（不同种族、宗教或性别的人）；（使）分开、分离、隔离
- a culture in which women are segregated from men
妇女受到隔离歧视的文化 - a racially segregated community
实行种族隔离的社会 - Police segregated the two rival camps of protesters.
警察把两个敌对阵营的抗议人群隔离开来。
延伸阅读：区别辨析isolate、separate、segregate与insulate
secure
英 [sɪˈkjʊə(r)] 美 [sɪˈkjʊr]
安心的、有把握的；可靠的、牢靠的、稳固的；安全的、稳妥的；（地方）守卫森严的、插翅难逃的
- That ladder doesn't look very secure to me.
那梯子我看不太稳固。 - He killed the man just a month after his release from a secure mental hospital.
他离开戒备森严的精神病院才1个月就杀了那个人。 - Her promotion has made her position in the company more secure.
她的升职使她在公司的地位更加稳固。 - Car manufacturers ought to produce vehicles that are more secure against theft.
汽车制造商应该生产出防盗性能更佳的汽车。 - Children need to feel secure in order to do well at school.
孩子们需要感到安心才能在学校中学习好。
延伸阅读：区别辨析safe与secure
