assign
同义：distribute , appoint , elect
派生：
assignment n. （分派的）任务，（指定的）作业；分配，选派
What are today’s ~s ?今天的任务（或作业）是什么？
assimilate
同义：absorb , integrate
反以：dissimilate
词组：
~ to (或with) 使相似；把……比作
~ a conqueror to a robber 把征服者比作强盗
练习：
The U.S has ____people from many European countries.
A. absorbed B. assimilated C. united D. enrolled
派生：
assimilation n. 吸收，同化
Technological advancement depends on the rapid ~ of new ideas.技术进步有赖于迅速吸收新思想。

associate
v.
同义：connect , unite , combine
反义：dissociate , isolate
词组：
~ oneself with 参加到……中去；对……公开表示赞同（或支持）：~ oneself with a cause 投身于一项事业
associate … with 联系，联系在一起；联想到：We associate Egypt with the Nile. 我们想起埃及就想起尼罗河。
n.
同义：fellow , partner
adj. 副的：an ~ professor 副教授
派生：
association n. 协会，社团；联合，结合，交往；联想；友谊，伙伴关系
the Modern Language Association of America 美国现代语言协会
an alumni ~ 校友会
长难句
While a selection of necessary details is involved in both, the officer must remain neutral and clearly try to present a picture of the facts, while the artist usually begins with a preconceived message or attitude which is then transmitted through the use of carefully selected details of action described in words intended to provoke associations and emotional reactions in the reader.
尽管两种文字的写作都须挑选必要的详细材料，但警官必须保持中立并尽可能清楚地陈述事实；而艺术家则往往以激发读者的联想和感情共鸣为目的，通过用文字对精心挑选的事实的细节从预设的要旨和感情出发来描述。