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短语讲解：

1. The Italian Prime Minister Enrico Letta has announced he will step down on Friday after his own Democratic party, the dominant party in Italy's ruling coalition voted for a change of government.

step down 退休，辞职
例句：The governor has rejected all calls to step down.
这位州长拒绝了所有要求他下台的呼声。

2. At a major conference in London on the illegal wildlife trade, a group of 46 countries has promised to take action on poaching.

take action 采取行动，行动起来
例句：Take action on your resource inventory.
在资源发掘中采取行动。

3. The US undersecretary of state and Russian deputy foreign minister have come to Geneva in order to put more pressure on the Syrian government and opposition delegations.

in order to 为了…
例句：One must believe in order to acquire understanding.
一个人为了能够获得理解就必须相信。

4. As far as the United Nations is concerned, we will certainly not leave one stone unturned if there is possibility to move forward.

as far as 只要; 远到…; 据…; 直到…为止
例句：As far as I know, he has gone to town. 
就我所知，他到镇子上去了。