慢速英语:Russian President Calls for Tougher Measures to Fight North Caucasus Terrorists

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call for要求

例句：The letter calls for an investigation of the facts.
      来信要求对这些事实进行调查。

需要

例句：More work doesn't necessarily call for more men.
      增加工作不一定要增加人员。

2.Chechen rebel leader Doku Umarov claimed responsibility for the Moscow bombings in the name of Islam.

in the name of以...的名义,凭

例句：He attended the party in the name of his father.
      他以他父亲的名义参加聚会。

3.He says the only solution is the establishment of real institutions of government throughout Russia.

the only唯一的

only, single, sole, unique, alone这些形容词均可表示“唯一的”之意。

only: 普通用词，常可与sole换用，但侧重仅限于指定的人或物，而不需要更多。
single: 语气较强，强调仅此一个，再无第二个。
sole: 语气强于only，指仅有一个或一群，只考虑这一个或这一群。
unique: 非正式用词，侧重在一类中唯一无可匹敌、无与伦比的特征。
alone: 着重专指某人或某物，而不是别的。

4.Many experts question whether the Russian government can carry out its threat to destroy the terrorists.

whether/if引导宾语从句

I don’t know whether he’ll arrive in time. 我不知道他是否能及时到。

I didn’t know whether they liked the place. 我不知道他们是否喜欢这个地方。

I’ll see whether I can induce him to accept it. 我要看看我是否能劝他接受。

I asked her whether she agreed. 我问她是否同意。

He enquired if her parents spoke Spanish. 他问她父母是否讲西班牙语。

I wonder if it’s large enough. 我不知道它是否够大。

She didn’t say if he was still alive. 她没说他是否还活着。