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1.strain n.血統(ancestry)；張力，拉緊(an act of straining or the condition of being strained)；【生】品種(kind, sort);v.拉緊(to draw tight)
例：Tom is of a noble strain.//Certain genetically modified strains of maize produce a powerful natural insecticide.
2.strait n．海峽(a comparatively narrow passageway connecting two large bodies of water)
例：the Strait of Gibraltar直布羅陀海峽
3.strand n．（線等的）股，縷(any of the threads, wires, etc. twisted together to form a rope or cable)
聯想記憶：只有一股繩( strand)是站(stand)不起來的
例：The ship is stranded at the beach.//Anne removed the strands of hair from the hairbrush.
4.strategic a.戰略上的(of, relating to, or marked by strategy);關鍵的，重要的(necessary to or important)
詞根記憶：來自strategy(n．戰略，策略)
例：Why firms adhere to or deviate from their strategic plans is poorly understood.
派生詞：strategically( ad.戰略性地；戰略上)
同根詞：strategist(n．戰略家；軍事家)
5.strategy n．戰略，策略(art of planning and directing an operation in a war or campaign)
詞根記憶：strat(層)+egy--講究層次和步驟--策略
例：Analysts assessed the effectiveness of this strategy.
派生詞：strategic(a．戰略上的)；strategist(n．戰略家)
6.stratosphere n.平流層，同溫層（位于對流層之上中頂層之下的范圍的大氣）(the part of the earth's atmosphere which extends from the top of the troposphere to about 30 miles( 50 kilometers) above the surface and in which temperature increases gradually to about 320F( 0℃) and clouds rarely form)
詞根記憶：strato(=strat層)+sphere(球)--圍繞在地球外的大氣層--平流層
例：In the stratosphere, ozone layer shields the Earth from the most biologically harmful radiation emitted by the Sun.
7.stray v.偏離，迷路(to wander away);a．迷了路的(having strayed or escaped from a proper or intended place);偶然發生的(occurring at random or sporadically)
發音記憶：死追--怎么追也追不上--迷路
例：Tourists often get lost and stray into dangerous areas.
派生詞：strayer(n.迷途者；流浪者)
8.strenuous a．費力的(arduous)
詞根記憶：stren(=strength力量)+uous--需要用力量的--費力的
例：Physical injuries sometimes result from entering a strenuous physical fitness program too quickly.
9.strife n．紛爭，沖突（bitter and sometimes violent conflict）
詞根記憶：strif(競爭)+e--紛爭
例：intestine strife內訌
adj. 確定的，必然的，特定的
pron.
