1.sheath n．鞘(a case for a blade( as of a knife))；防護物(sheathing)
例：It is possible that many prehistoric microbes evolved without significant modification of their sheaths.
2.shed v.脫落（即蛻皮）(discard)；流出，散發（to give off or out）
例：Until they are fully grown, horseshoe crabs(馬蹄蟹)shed their shells and grow new ones several times a year. ll shed warmth and light發光發熱
3.sheer a．薄的(thin)；純粹的(pure)
例：sheer curtains 薄窗簾//sheer brandy純正白蘭地
4.shellfish n.甲殼類動物(an aquatic invertebrate animal with a shell)
分拆記憶：shell(殼)+fish(魚)--甲殼類動物
例：As envisioned by researchers, commercial farming of lobsters will enable fisheries to sell the shellfish year-round.
5.shelter n．躲避處(a protective structure)；v.庇護，保護(protect)
例：food, clothing, shelter and transportation衣食住行//The blue butterfly depended on the nests to shelter its offspring.
6.shield n．盾(a broad piece of defensive armor carried on the arm);保護物(protector);y．(from)保護(protect);擋開(defend)
記：要牢記shield的原始意義“盾”，其他意義均可引申而來
例：lf the protective shield is not in place, the machine will not operate. //The patents can shield patent-holding manufacturers from competitors.
派生詞：windshield(n．擋風玻璃)
7.shimmer n．微光，閃光(a light that shimmers);譏使閃爍，發閃爍的微光(to glimmer)
聯想記憶：她站在夏天( summer)的夜空下看星星閃爍(shimmer)發光
例：The shimmer and sheen of both fabric and skin depend on the geometry of their internal structures-the exact arrangement of threads or protein fibres.
8.shortfan n．虧空(deficit)：不足(shortage)
聯想記憶：short(短)+fall(下落)--因收入下降而短少--虧空
例：The new policy of tax cuts issued by the government resulted in a shortfall in Federal revenues.//There will be a shortfall in wheat supplies this year.
9.shrill a．（批評）尖銳的(sharp)；刺耳的(piercing)
例：shrill criticism尖銳的批評//a shrill whistle刺耳的汽笛聲