1.inoculate v.接种；给…预防注射(to introduce a serum ,a vaccine, or an antigenic substance into, especially to produce or boost immunity to a specific disease)

词根记忆：in（不）+ ocul（萌芽）+ate--不让萌芽成长--给…预防注射

派生词：inoculation(n．接种，接木)

2.inquisitive a．好奇的(curious)

词根记忆：in+quisit(询问)+ive--不断询问的--好奇的

例：The tone of the passage is inquisitive.

同根词：prerequisite(n．先决条件)：inquisition(n.调查)

3.inscribe v.刻(to engrave)；【数】使（图形）内接（切）(to draw within another figure so that every vertex of the enclosed figure touches the outer figure)

词根记忆：in+scribe(写，刻)--刻

例：Bill gave Susan a ring inscribed with the words "To my best girl".

派生词：inscription(n．铭刻；题字)

4.inscription n．题词(the dedication of a book or work of art);铭文(sth. that is inscribed)

词根记忆：来自inscript (v.碑铭：题字)

例：Stone inscriptions in a form of the Greek alphabet that was definitely used in Cyprus after A.D. 365 were found in Kourion.

同根词：description(n．描绘)

5.insecticide n.杀虫剂(a chemical substance used to kill insects)

词根记忆：insect(昆虫)+i+cide(杀)--杀昆虫的东西--杀虫剂

例：a powerful insecticide一种强效杀虫剂

同根词：pesticide(n．杀虫剂)

6.insert v.插入(to put or thrust in)

词根记忆：in（进入）+sert(插，放)--插进去--插入

例：Please insert your credit card into the slot.

同根词：exsert (v.突出，伸出)；assert(v.断言)

7.insight n．洞察力，见识(penetration, discernment)

联想记忆：in+sight(眼光)--眼光深入--洞察力

例：Life stories provide incidental information as well as significant insights into a way of life.

8.insignificant a.无价值的，无意义的，无用的(lacking meaning or importance, unimportant)

词根记忆：in（无）+signifi(意味着)+cant--无意义的

例：The scrapping of automobiles causes insignificant amounts of air pollution.

派生词：insignificantly( ad.无关紧要地)

同根词：significant(a．有意义的)

9.insofar as 到…程度；在…范围内(to the degree or extent that)

例：This is the truth insofar as I know it.