重点讲解：
1. take on 与(尤指实力比自己强的人)较量；接受…的挑战；
The world's most prestigious insurance company was last night squaring up to take on MPs who have accused it of being riddled with corruption.
世界上最负盛名的保险公司昨晚作出回应，要和那些指责其腐败泛滥的议员们较量一番AFt3U;5kf[KU。
2. set fire to 放火烧；使燃烧；
They set fire to vehicles outside that building.
他们纵火焚烧了停在那幢大楼外的车辆Lnu~wd[]8fo.)X(t@8X!。
3. break into 强行进入；闯入；
There was no one nearby who might see him trying to break into the house.
附近没有人可能会看见他试图闯入房子里R~ALDGYbk*5Pl(H*。
4. call on sb. to do sth. 要求；呼吁；号召；
I call on everyone to renounce the use of violence and armed struggle.
我呼吁每个人都放弃使用暴力和武装斗争#.2OUY!~aTQJ。