1.seesaw n. 跷跷板(a pastime in which two children or groups of children ride on opposite ends of a plank balanced in the middle so that one end goes up as the other goes down)
联想记忆：see(看)+saw( see的过去式，看)--看了又看--上下或往复的移动--秋千
2.segment n.线段(the finite part of a line between two points in the line)；部分，环节(fragment, part)
词根记忆：seg(=sect部分)+ment--线的一部分--线段
例：line segment线段//market segment市场区隔
3.segregate v.(from)隔离(to isolate);分开(to separate)
词根记忆：se(分开)+greg(团体)+ate--和团体分开--隔离；分开
例：In many cities, blacks were segregated from whites.//The staff segregated the boys from the girls during gym class.
派生词：segregation(n.隔离：分开)
4.segregation n. 隔离，分离(the act or process of segregating)
词根记忆：来自segregate(v.使隔离)
例：Many young Americans are not able to imagine, even less to remember, what segregation was like.
派生词：segregationist(n．种族隔离主义者)
同根词：segregator(n．分离器)
5.seismic a．地震的，有关地震的(of, subject to, or caused by an earthquake)
词根记忆：seism(地震)+ic--地震的
例：seismic waves地震波
派生词：seismologist(几．地震学家)
6.select v.挑选，选择(to pick out)
词根记忆：se(分开)+lect(选)--分开来选--挑选
例：The more a depositor has to deposit, the more careful he or she tends to be in selecting a bank.
派生词：selective(a．选择性的)
7.semicircle n．半圆(a half of a circle)；半圆形体(an object or arrangement of objects in the form of a half circle)
词根记忆：semit半）+circle（圆周，圆形）--半圆形体
例：The rectangular region contains two circles and a semicircle.
8.semiconductor n.半导体(a substance whose electrical conductivity is between a conductor and an insulator)
词根记忆：semi(半)+conduct(传导)+or(物)--半导体
例：Instead, semiconductor firms simply squeezed more patents out of existing research and development expenditures.
9.seminal a．开创性的(creative, original)：重要的(influential)；种子的；精液的(of, relating to, or consisting of seed or semen)
词根记忆：semin（种子）+al--种子破土而出--开创性的
例：the seminal existential novel开创性存在主义小说//a seminal book有重大影响的书
同根词：disseminate(v.播种)
10,seminar n.研讨会(a meeting for giving and discussing information)
联想记忆：semin（种子）+ar--培养种子的地方，产生创意的地方--研讨会
注意：seminary(n．神学院)
例：Many lawyers attended a seminar on tort reform.