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Public officials can finally be held accountable for their actions.
终于要对政府官员实行问责了。 

2.in a decade 十年内

Power generation fell for the first time in a decade.
发电量十年来首次出现下降。

3.pay down 偿还；支付

I used it to pay down some credit cards.
我用来付信用卡帐了。

4.social media 社交媒体

We have all witnessed the power of social media.
我们见证了社交媒体的实力。