重点讲解：
1. back off 放弃，收回（主张、要求、承诺等）；
The government backed off from a confrontation.
政府放弃对抗[V6gLvOBLHC。
2. take over 接管，控制；
The Belgians took over Rwanda under a League of Nations mandate.
比利时人依照国际联盟的授权接管了卢旺达PqX0CvfHNC9n,&X4V9dM。
3. prior to 在…之前；先于；
He knew about the interview prior to its publication and had actually previewed the piece.
这篇访谈在发表以前他就已经知道了，并且实际上还预先阅览过j@vPw&h-pgKP+T9p(P。
4. under siege 被包围；被围困；被封锁；
The journalists found a city virtually under siege.
记者发现的是一个几乎被围困的城市rYgpL-sm3G)&ZShv65M.。