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1.surplus n．过剩，剩余（物）(remainder)；a．剩余的(more than what is needed or used)
联想记忆：sur(下面)+plus(加，多余的)--剩在下面的就是多余的--剩余的
例：The clothing factory donated its surplus to charity.//Surplus stocks of pepper have been reduced in the past three years.
2.survey v.调查（to investigate）；视察（to inspect）n．调察（investigation）
例：marketing survey市场调查//The company will periodically survey its employees to determine the introduction of the new strategy.
派生词：surveyor(n．测量员：检察员)
3.susceptible a．(to)易受影响的（liable）；敏感的（responsive）
词根记忆：sus+cept(接受)+ible--心里接受--易受影响的
例：Humans are genetically susceptible to some diseases.
派生词：susceptibility(n，易感性)
4.suspect v.怀疑(to doubt)；推测(to speculate)n.嫌疑犯(a person suspected of a crime)
联想记忆：su+spect(看)--偷偷看--怀疑
例：She suspected the police of having illegally taped her confidential conversations with her client.//The officer took the suspect to the police station.
5.suspicion n．怀疑，猜疑(mistrust ,doubt)
例：The action at once awakened suspicion.
同根词：suspicious(a．猜疑的，可疑的)
6.sustain v.支持，维持(to keep up)；遭受（to suffer）
词根记忆：sus(下面)+tain--在下面支撑住--支持
例：To compete in international markets ,a nation's businesses must sustain investment in intangible and physical assets.
派生词：sustained(a．持续不变的)
7.sustenance n．食物，养料《nourishment）
例：This article explained how reef communities acquire sustenance for survival.
8.swiftly ad.很快地，即刻（quickly）
词根记忆：来自swift(a．迅速的，快的)
例：Passengers must exit airplanes swiftly after accidents, since gases released following accidents are toxic to humans.
9.symbiotic a.共生的，共栖的(living together in close union of two dissimilar organ-isms)
词根记忆：sym(共同)+bio(生命)+tic--享有共同的生命--共生的
例：symbiotic relationship共生关系
vi. 竞争，对抗，比赛
