admire [ ad- = at 对；mir = to wonder 惊奇；-e=>“to wonder at 对 …感到惊奇”→] v. regard as wonder 钦佩，赞美 / We admired the courage of the astronauts.我们对于宇航员的勇气表示钦佩。

admiration n. 钦佩，赞美

admirable a. 令人钦佩的；极妙的

advocate [ad-=to 向；voc= to call 喊；-ate n.= person 人=>“a person who calls to 向…呼喊的人”→] n. person who speaks in favour 拥护者，提倡者 / He is an advocate of the new theory.他 是那种新理论的拥护者。

下面举例说明ad-的异体ab-，af-，ag-等的构词情况，请注意词根首字母的特点。

abbreviate [ ab- (ad-)=to 到;brevi = short 短;-ate v.= to make 使=>“to make short to a certain degree 使变短到某种程度”→] v. shorten (a word or phrase)缩写；简略 / We can abbreviate“Monday”to “Mon.”.我们可以将 Monday 缩写成 Mon.。

abbreviation n. 缩写；缩写词

affect [ af- ( ad-) = to 对；feet = to do 做=>“to do sth. to 对…做了某事”→] v. act on; produce a result on 影响 / The disease affected his memory. 那疾病影响了他的记忆力。

aggress [ ag- (ad- ) = to 向；gress = to step 跨步=>“to step to sb. 向某人逼近一步”→] v. make the first attack; begin a war 攻击，挑衅；侵略/ Who aggressed in the fight?是谁先动手打人的？

aggression n. 侵略 

aggressive a. 侵略的；爱寻衅的