invade [ in- = into入；vad = to go 走；“to go into other's place 走入他人之地”→]v. enter with armed forces 侵入，侵略 / Soldiers invaded the country to conquer it.军队侵入该国以图占领它。

invasion n. 入侵；侵略;闯入 

invasive a. 侵略的；侵害的

以下是几个含il-，im-，ir-的原生词。

illustrate [ il- (in-) = on 在…上；lustrate = to light 照=>“to light on sth. 照亮某物”→]v. make clear by stories, examples, etc. 说明，阐明 / These graphs illustrate the results of the experiment. 这些图表说明了实验的结果。

illustration n. 说明;图解;例证；插图 

illustrative a. 用作说明的；作为例证的

imbibe [ im- (in-) = in入;bibe = to drink 饮→]vt. drink in; absorb 饮入；吸收 / The roots of a plant imbibe moisture from the earth. 植物的根从土壤中吸收水分。

imbibition n. 吸收，吸人

irradiate [ir-(in-) = upon 在…之上；radiate = to shine 照射→] v. shine upon; make bright 照耀；使发光 / The midnight lightnings irradiate the heaven. 夜半的闪电照亮了天空。

irradiation n. 照耀，发光；阐明，启发