1.encroach v.侵犯，侵害(to enter into the possessions or rights of another)

例：The lawyer argues that a state law prohibiting smoking in public places unfairly encroaches on the rights of smokers.

派生词：encroachment(n.侵犯)

同根词：crochet(v.用钩针编织)

2.encyclopedia n.百科全书(a work that contains information on all branches of knowledge or treats comprehensively a particular branch of knowledge usually in articles arranged alphabetically often by subject)

词根记忆：en+cyclo(环，圆)+ped（儿童）+ia--教给儿童全面知识的书--百科全书

例：A salesman sells 12 identical sets of encyclopedias and makes $1,800 in commissions.

派生词:encyclopedic(a．如百科辞典的，百科全书式的)

同根词：pediatrics(n.儿科)

3.endanger v.危及，危害(to bring into danger or peril)

词根记忆：en+danger(危险)--危及

例：The use of pesticides may be endangering certain plant species dependent on insects for pollination.

4.endeavor n.努力(serious and determined effort);事业(enterprise)

词根记亿：en+deavor(责任)--责任重大的事情一事业

例：They were frequently joint endeavors by members of two or three different ethnic groups.//Cattle raising is less lucrative than other endeavors.

5.endemic a．地方性的(restricted or peculiar to a locality or region)；n．

例：endemic disease地方病

同根词：eprdemic(a．流行性的)；pandemic(a．广泛的)

6.endorphin n.【生化】内啡肽（主要存在大脑中，可缓解痛感并影响情绪）(any of a group of endogenous peptides found especially in the brain that bind chiefly to opiate receptors and produce some pharmacological effects like those of opiates)

例：The presence of endorphins may help to explain differences in response to pain signals.

7.endorse v.背书(to sign one's name as payee on the back of a check in order to obtain the cash or credit represented on the face);支持，赞同(to approve)

词根记忆：en+dorse(背)一在背面写字-背书，商业上的背书一般表示认可，引申为支持

例：The bank teller reminded me to endorse the check l was cashing.//I do not endorse your choice of friends.

派生词:endorsement(n.背书，认可)

8.endothermic a．【动】温血的，恒温的( warm-blooded)

词根记忆：endo(到…里面)+therm(热)+ic --从里面散发热的--温血的，恒温的

派生词:endothermic species温血物种

9.enforce v.实施,执行(to carry out effectively)

词根记忆：en(使…)+force(力量)--使力量体现--实施，执行

例：The extant workplace safety regulations were stringently enforced.

派生词:enforcement(n．执行，强制)；unenforceable(a．无法执行的)

10.enfranchisement n.解放，释放(setting free)

词根记忆：来自franchise(v.解放；给予权利)

例：female enfranchisement妇女解放

同根词：enfranchise(v.给予选举权;解放)