1. abjure [?b'd???] v ；adjure [?'d???] v

·abjure的意思是"公开放弃"：

In the mid-1970's, a young European couple abjured middle-class comforts in favor of travel to India. 20世纪70年代中期，欧洲的一对年轻夫妇放弃中产阶级的安逸生活，去印度旅行。

·adjure 的意思是"恳求"：

"I adjure you in the name of God to tell the truth before this court," Mr.Smith pleaded. "我恳求你以上帝的名义在法庭上说出真相。"史密斯先生恳求道。

2. aboard [?'b??d] adv ；abroad [?'br??d] adv

·aboard 的意思是"在（船、飞机或车）"上：

All 224 people aboard a Russian airliner were killed early Saturday when the Airbus A321 crashed in Egypt's Sinai peninsula shortly after takeoff from a popular Read Sea resort town, officials say. 官方报道，一架俄罗斯的空客A321客机从红海一个繁华的度假胜地起飞后不久就坠毁在埃及西奈半岛，机上224名人员全部遇难。

·abroad的 意思是"在国外"：

The president is severely weakened and has very little credibility or support at home or abroad. 总统的声誉受到了严重的损害，在国内和国外没有多少信誉和支持。

3. absorb[?b's??b] v ；adsorb [?d's??b] v

·absorb的意思是"吸收（液体、气体、光、热等）"：

Historically, about half of the pollution from human sources has been absorbed by the oceans and by terrestrial plants, preventing temperatures from rising as quickly as they otherwise would, scientists say. 科学家们说，从历史上看，海洋和森林吸收了50%的人造污染，防止了本应升高的地球温度。

·adsorb的意思是"吸附在……表面"：

Another theory suggests that the char itself adsorbs nutrients and slowly releases it to plants over time. 另外一种理论指出，炭本身吸附养分，经过一段时间再慢慢把养分释放给植物。

4. abstract ['?bstr?kt] adj ；obstruct [?b'str?kt] v

·abstract意思是"抽象的，纯理论的"：

"Retirement is an abstract concept for a boy who has just entered the primary school," the teacher told the class. 老师对全班同学说："退休对一个刚进入小学的孩子来说是一个抽象的概念。"

·obstruct意思是"阻碍，堵塞"：

With 24 hours of sunlight in these summer months, and no trees to obstruct the view, visibility extends for miles. 在夏天的几个月里，每天日照时间达24小时，又没有树木遮挡视线，能见度达数英里。