1.era n.纪元，年代(period in history starting from a particular time or event);时代(period)

例：For the first time in the modern era, non-Hispanic Whites are officially a minority in California.

2.eradicate v.根除，消灭(to exterminate)

词根记忆：e（出）+radic(根)+ate--连根拔出--根除

例：The anopheles mosquito(疟蚊)has been eradicated in many parts of the world.

3.eradication v.消灭，根除(the complete destruction of every trace of sth.)

词根记忆：来自eradicate(v.根除，消灭)

例：The success of the program to eradicate smallpox has stimulated experts to pursue what they had not previously considered possible-better control, if not e,adication, of the other infections such as measles and yaws.

4.erase v.擦掉，抹去(to rub or scrape out)；消除(to remove from existence or memory as if by erasing)

词根记忆：e+rase(擦)一擦掉

例：Please erase the blackboard.//The considerable progress made by Black people was erased by the new law.

5.ergonomic a.人类环境改造学的;人类工程学的(of or relating to ergonomics)

例：Designers of everything from cars to computer monitors have adopted a cornerless style of smooth surfaces and curves that is more errjonomic.

6.erode v.侵蚀(to wear away by the action of water or wind)；削弱，损害(to cause to diminish, deteriorate, or disappear)

词根记忆：e+rode(咬)一咬掉--侵蚀

例：A constant stream of water eroded the rock mountain.

派生词:erosion(n.侵蚀，腐蚀)

7.errand n.差使（事）（如送信，买东西等）(a short trip taken to attend to some business often for others)

词根记忆：err（漫游）+and一跑来跑去一差使

例：Some family vehicles are used primarily for making short local trips,such as to do errands.