arbitrary【 'ɑ:bitrəri】 
adj.任意的，武断的，独裁的，专断的
 It seems so arbitrary.这样做似乎太武断了。
 There was nothing arbitrary about his actions.他的行动一点也不武断。
arc【 ɑ:k】 
n.弧，弓形，拱
The arc is a common feature in Western architecture.
拱形是西方建筑中最普遍的特色。
 The curve ball is also called an arc line ball.曲线球也叫做弧线球。
arch【 ɑ:tʃ】 
n.拱门，弓形结构，拱形；v.（使）弯成弓形；adj.主要
The gymnast could arch her back very far.
那个体操运动员可以很大幅度地弯曲她的背。
 The couple walked underneath the arch.这对夫妇在这个拱门下面散步。
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archaeology【 ,ɑ:ki'ɔlədʒi】 
n.考古学
I have been interested in archaeology since I was a small child.
从我还是孩童开始，我就对考古学感兴趣了。
 Industrial archaeologists should be distinguished from other kinds.工业考古学者应有别于其他类型。
architect【 'ɑ:kitekt】 
n.建筑师
He is not a draftsman;v he is an architect.
他不是绘图员，是个建筑师。
 The architect designed the house.那个建筑师设计了这栋房子。
architecture【 'ɑ:kitektʃə】 
n.建筑，建筑学，体系机构
I like classical architecture very much.
我非常喜欢古典主义建筑。
 He enjoyed looking at pictures of Babylonian architecture.他喜欢看巴比伦的建筑的照片。
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ardent【 'ɑ:dənt】 
adj.热心的，热情洋溢的，激烈的，燃烧般的
The woman is an ardent feminist.
这个女子是个热心的女权主义者。
 She doesn't reciprocate my ardent feelings toward her.她对我热烈的爱没有回应。
area【 'ɛəriə】 
n.范围，区域，面积，地区，空地
I have never worked in this area before.
我没有这方面的任何工作经验。
 The entire area was covered in debris.整个地区被碎片所覆盖。
arena【 ə'ri:nə】 
n.竞技场，舞台
The players are marching into the arena.
参赛者们正走向赛场。
 New people often succeed in this arena.新人往往在竞技场上取得成功。
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