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1.strain n.血统(ancestry)；张力，拉紧(an act of straining or the condition of being strained)；【生】品种(kind, sort);v.拉紧(to draw tight)
例：Tom is of a noble strain.//Certain genetically modified strains of maize produce a powerful natural insecticide.
2.strait n．海峡(a comparatively narrow passageway connecting two large bodies of water)
例：the Strait of Gibraltar直布罗陀海峡
3.strand n．（线等的）股，缕(any of the threads, wires, etc. twisted together to form a rope or cable)
联想记忆：只有一股绳( strand)是站(stand)不起来的
例：The ship is stranded at the beach.//Anne removed the strands of hair from the hairbrush.
4.strategic a.战略上的(of, relating to, or marked by strategy);关键的，重要的(necessary to or important)
词根记忆：来自strategy(n．战略，策略)
例：Why firms adhere to or deviate from their strategic plans is poorly understood.
派生词：strategically( ad.战略性地；战略上)
同根词：strategist(n．战略家；军事家)
5.strategy n．战略，策略(art of planning and directing an operation in a war or campaign)
词根记忆：strat(层)+egy--讲究层次和步骤--策略
例：Analysts assessed the effectiveness of this strategy.
派生词：strategic(a．战略上的)；strategist(n．战略家)
6.stratosphere n.平流层，同温层（位于对流层之上中顶层之下的范围的大气）(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)
词根记忆：strato(=strat层)+sphere(球)--围绕在地球外的大气层--平流层
例：In the stratosphere, ozone layer shields the Earth from the most biologically harmful radiation emitted by the Sun.
7.stray v.偏离，迷路(to wander away);a．迷了路的(having strayed or escaped from a proper or intended place);偶然发生的(occurring at random or sporadically)
发音记忆：死追--怎么追也追不上--迷路
例：Tourists often get lost and stray into dangerous areas.
派生词：strayer(n.迷途者；流浪者)
8.strenuous a．费力的(arduous)
词根记忆：stren(=strength力量)+uous--需要用力量的--费力的
例：Physical injuries sometimes result from entering a strenuous physical fitness program too quickly.
9.strife n．纷争，冲突（bitter and sometimes violent conflict）
词根记忆：strif(竞争)+e--纷争
例：intestine strife内讧
adj. 确定的，必然的，特定的
pron.
