1.seesaw n. 蹺蹺板(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)
聯想記憶：see(看)+saw( see的過去式，看)--看了又看--上下或往復的移動--秋千
2.segment n.線段(the finite part of a line between two points in the line)；部分，環節(fragment, part)
詞根記憶：seg(=sect部分)+ment--線的一部分--線段
例：line segment線段//market segment市場區隔
3.segregate v.(from)隔離(to isolate);分開(to separate)
詞根記憶：se(分開)+greg(團體)+ate--和團體分開--隔離；分開
例：In many cities, blacks were segregated from whites.//The staff segregated the boys from the girls during gym class.
派生詞：segregation(n.隔離：分開)
4.segregation n. 隔離，分離(the act or process of segregating)
詞根記憶：來自segregate(v.使隔離)
例：Many young Americans are not able to imagine, even less to remember, what segregation was like.
派生詞：segregationist(n．種族隔離主義者)
同根詞：segregator(n．分離器)
5.seismic a．地震的，有關地震的(of, subject to, or caused by an earthquake)
詞根記憶：seism(地震)+ic--地震的
例：seismic waves地震波
派生詞：seismologist(幾．地震學家)
6.select v.挑選，選擇(to pick out)
詞根記憶：se(分開)+lect(選)--分開來選--挑選
例：The more a depositor has to deposit, the more careful he or she tends to be in selecting a bank.
派生詞：selective(a．選擇性的)
7.semicircle n．半圓(a half of a circle)；半圓形體(an object or arrangement of objects in the form of a half circle)
詞根記憶：semit半）+circle（圓周，圓形）--半圓形體
例：The rectangular region contains two circles and a semicircle.
8.semiconductor n.半導體(a substance whose electrical conductivity is between a conductor and an insulator)
詞根記憶：semi(半)+conduct(傳導)+or(物)--半導體
例：Instead, semiconductor firms simply squeezed more patents out of existing research and development expenditures.
9.seminal a．開創性的(creative, original)：重要的(influential)；種子的；精液的(of, relating to, or consisting of seed or semen)
詞根記憶：semin（種子）+al--種子破土而出--開創性的
例：the seminal existential novel開創性存在主義小說//a seminal book有重大影響的書
同根詞：disseminate(v.播種)
10,seminar n.研討會(a meeting for giving and discussing information)
聯想記憶：semin（種子）+ar--培養種子的地方，產生創意的地方--研討會
注意：seminary(n．神學院)
例：Many lawyers attended a seminar on tort reform.