1.novice n．新手(beginner)

词根记忆：nov(新)+ice(人)一新手

例：I helped my boss train the novices.

2.noxious a．有毒的，有害的(harmful, poisonous)

词根记忆：nox(毒)+ious--有毒的

例：A shed behind the factory is filled with noxious chemicals.

3.nuclear a．核心的(center)；核子的，原子能的(atomic)

词根记忆：nucle（核的）+ar--核心的；核子的

例：nuclear family核心家庭//nuclear weapon核武器

4.nucleon n．核子（a proton or neutron especially in the atomic nucleus)

词根记忆：nucle(核的)+on(物)--核子

例：Great mass is synonymous with huge numbers of nucleons.

派生词：nucleic(a.核的，核子的)

5.nucleotide n.核苷酸（any of various compounds consisting of a nucleoside combined with a phosphate group and forming the basic constituent of DNA and RNA)

例：nucleotide sequence核苷酸序列

6.nucleus n.[pl. nuclei]核，核心(a central or essential part around which other parts are gathered or grouped ;a core)

例：cell nuclei细胞核

7.nuisance n.讨厌的人：麻烦事( one that is annoying, unpleasant, or obnoxious)

联想记忆：讨厌的人(nuisance)说什么都是废话(nonsense)

例：This method allows for effective control of nuisance algae while leaving solar ponds as one of the cleanest technologies providing energy for human use.

8.numerator n.【数】分子：(the part of a fraction that is above the line and signifies the number to be divided by the denominator)

联想记忆：numer(数)+ator--变化了产生新的数--分子

注意：denominator(n．分母)

例：What is the sum of the numerator and denominator of the original fraction?

9.nutrient n．营养物，滋养物质(substance serving as or providing nourishment)

词根记忆：nutri（滋养）+ent(表物)--滋养物质

例：To maintain the nutrient s in the soil, corn and soybeans are often planted in a field in alternate years.

同根词：nutritious(a．有营养的；滋养的)