重點講解：
1. at risk of 處境危險；有風險的；在危險中；
Everybody who goes into this region, whoever they are, is at risk of being taken hostage.
進入這個地區的人，不管是誰，都有被劫為人質的危險oH-#IR]er!7hE!,4。
2. gain the upper hand 上風；優勢；有利地位；
The two sides were so well-matched that neither could gain the upper hand.
旗鼓相當，勝負難分-NZ+9RO&h)2WzN2。
3. return to 重新開始，繼續（某項活動）；
At that stage he will be 52, young enough to return to politics if he wishes to do so.
那時他將會是52歲，還很年輕，如果他希望的話，仍可重返政壇H%FfWTGE~Y.IW34RQ#LY。
4. due to 由于；因為；
Mistakes due to carelessness may have serious consequences.
由粗心大意造成的錯誤有可能帶來嚴重的后果fLS5MvEgwBXh|_。