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1.sentinel n．哨兵(sentry)
詞根記憶：senti(感覺)+nel--感覺者--哨兵
注意：sentry(n．哨兵)
例；The sentinel was stationed on a hill.
2.separate a．分開的(detached)；單個的(individual)；不同的(distinct, dissimilar);v.(from)分開(distinguish)；分類(sort)
詞根記憶：se（分開）+par(相等)+ate--（使）分成份--分開
例：Restaurants of the city can maintain separate dining areas where smoking is permitted.//Residents should separate recyclable bottles are cans from recyclable paper products.
派生詞：separately( ad.個別地：分離地)：separation(n.分離)
3.sequence n.順序(an order of succession)；序列(an ordered set of quantities)
詞根記憶：sequ(跟隨)+ence--跟隨，連續--序列
例：New techniques for determining the molecular sequence of the RNA have produced evolutionary information.//arithmetic sequence數列
派生詞：sequential(a．連續的；一連串的)
4.sequester v.（使）隱退(to seclude; withdraw);使隔離(to set apart)
注意不要和sequestrate(v.扣押)相混
例：As recently as 1950, tuberculosis was never curable unless patients were sequestered in sanitariums; today, the drug Isoniazid has made such treatment obsolete.
派生詞：sequestered（a．隱退的：偏僻的）
5.session n．會議(conference)：集會（a meeting devoted to a particular activity）
例：regular session常規會議//an all-night dancing session通宵舞會
6.severe a．嚴重的(serious)；嚴厲的(austere)；嚴酷的(harsh)
聯想記憶：曾經(ever)嚴酷的(severe)日子，一去不復返了
例：Most countries in the world have severe air pollution.//The angry parents gave the naughty child a severe punishment.
派生詞：severely( ad.嚴格地；嚴重地)；severity(n．嚴重；劇烈)
7.sewage n.污物，污水(refuse liquids or waste matter usually carried off by sewers)
詞根記憶：sew(排水)+age--排出的水--污水
派生詞：sewage disposal污水處理
8.shareholder n．股票持有人；股東(stockholder)
分拆記憶：share(分享；股票)+holder(持有者)--股票持有人
例：The individual shareholder will reap only a minute share of the gains.
派生詞：shareholding(n．股權)
9.shatter v.粉碎，砸碎(to break into pieces)；破壞（to destroy; demolish）
記：與scatter(v.分散)一起記
例：The sea dashed the ship to shatter against the rock.//Heating could shatter the nutrition of food.
n. 污染，污染物
