他于去年五月份正式就任总统。
该党于去年五月赢得了绝对的胜利。
得力于去年五月安装在哈勃空间望远镜上的两台新设备，对臭虫星云的认识得以焕然一新。
The Bug Nebula is getting a makeover thanks to two new instruments mounted on the Hubble Space Telescope last May.
白宫也对此表示担忧：奥巴马发表于去年五月的国家安全策略承诺投入精力应对本土的激进化。
The White House is worried too: Barack Obama’s National Security Strategy, published last May, promised to invest in efforts to counter radicalisation at home.
白宫也对此表示担忧：奥巴马发表于去年五月的国家安全策略承诺投入精力应对本土的激进化。
The White House is worried too: Barack Obama’s National Security Strategy, published last May, promised to invest in efforts to counter radicalisation at home.
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