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1.signature n.簽名，簽字(person's name written by himself)
詞根記憶：sign(記號)+ature--加自己名字做記號--簽名
例：A check's authenticity includes reminders to watch the endorsement, compare signatures, and view the watermark while holding the check to the light.
同根詞：signify(v.表示：意味)
2.significance n．意義：重要性(the quality of being important)
詞根記憶：來自significant(a．有意義的；重大的)
例：A phenomenon is described and its scientific significance is dis- cussed.
同根詞：signify(v.表示；有重要性)
3.significant a．相當數(shù)量的(considerable)；意義重大的{having an important meaning）
詞根記憶：sign(記號)+i+fic(做)+ant--值得做記號的--意義重大的
例：Their removal may not have led to significant increases in populations of smaller predators.
派生詞：significance(n．意義)；significantly( ad.顯著地)
同根詞：signature(n．署名，簽名)
4.signify v.表示，意味著(to mean)
詞根記憶：sign(信號)+ify--用信號表示
例：Dark clouds signify that it will rain soon.
5.silkworm n．蠶，桑蠶(a moth whose larva spins a large amount of strong silk in constructing its cocoon)
分拆記憶：silk(蠶絲)+worm(蟲)--吐蠶絲的蟲--蠶
例：The gypsy moth was imported into Massachusetts from Europe in 1869 by a French scientist attempting to develop a strong strain Of silk- producing insects by crossing gypsy moths with adult silkworms.
6.similarity n．相似點(the quality or state of being similar)
詞根記憶：來自similar(a．相似的)
例：Almost like clones in their similarity to one another, members of the cheetah species are especially vulnerable to disease because of their homogeneity.
同根詞：dissimilar(a．不同的)
n. 支持，認可，背書
