重点讲解：
1. look into 考察；调查；研究；
The government has instituted a court of inquiry to look into the allegations.
政府已成立了调查法庭来调查这些指控P!bX9DK,9~_9jpk。
2. shoot down 击落(飞机、直升机、导弹等)；
He was able to shoot down a flying bird with the bow and arrow.
他张弓搭箭能射落空中的飞鸟m@[;cj_iKdnuTYktIEF。
3. in retaliation for 报复；
The attack is thought to have been in retaliation for last week's bombing.
这次攻击被认为是对上周轰炸的报复行动R[tcpnuFeEklTQ。
4. assist with 帮助，协助(完成工作)；
Foreign Office officials assisted with transport and finance problems.
外交部官员帮助解决运输和经费问题QOt7P*9L|5。