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。
argue【 'ɑ:gju:】 
vi.争论，辩论；vt.说服
Our children always argue with one another.
我们的孩子经常吵架。
 I would argue that you are not right.我认为你是不对的。
argument【 'ɑ:gjumənt】 
n.争论，辩论，论据，论点，（for，against）意见
Let's end this argument.
让我们结束这场争论。
 The argument was faulty.这个争论是不对的。
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arise【 ə'raiz】 
vi.出现，发生，起因于
I like to end disputes as soon as they arise.
我喜欢争执一出现就加以解决。
 Accidents can arise from carelessness.疏忽会引起事故。
aristocrat【 'æristəkræt】 
n.贵族
Many aristocrats were killed by Pol Pot's regime.
许多贵族都被波尔·布特政权迫害了。
 Many criticize that the government is run by aristocrats.许多人批评政府是由贵族管理的。
arithmetic【 ə'riθmətik】 
n.算术，算法
Your arithmetic is not correct.
你的算法是不正确的。
 He was always good at arithmetic.他算术一直很好。
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arm【 ɑ:m】 
n.臂，臂状物，衣袖，海湾，武器；vt.供给，提供，武装，装备；vi.武装起来
The couple strolled arm in arm.
那对夫妻手挽着手散步。
 A bee has stung my arm.一只蜜蜂叮了我的手臂。
armor【 'ɑ:mə】 
n.装甲，盔甲，装甲钢板，装甲部队
The arrow grazed his armor.
箭划破了他的铠甲。
 He was relieved to take off the heavy armor.他放心地脱下了沉重的盔甲。
army【 'ɑ:mi】 
n.陆军，军队，大群，大军
The army should defend the country.
军队必须保卫国家。
 He wants to go into the army.他想参军。
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