1. Greece has been at the center of a political and economicstruggle that threatens many of Europe’s economies.

at the center of 在...中心
例句：At the center of the square stands a monument in black marble. 
在广场的中央耸立着一座黑色大理石的纪念碑。

2. On the day the Olympic flame was lit, Greek Socialist leaderEvangelos Venizelos began an attempt to form a new government.

attempt to do 尝试做某事（表示具体的尝试）
例句：Don't attempt to do it by yourself. 
你别企图独自去做。 

3. They could deny future payments from the financial rescue planagreed to in February.

agreed to 同意;接受
例句：Do you agree to my plan?
你接受我的计划吗? 
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