讲解：

call sb in
召来,叫来(服务):
to call in a doctor / the police
请医生/叫警察来

call sth off
取消；停止进行:
to call off a deal / trip / strike
取消交易/旅行/罢工
The game was called off because of bad weather.
比赛因天气恶劣被取消。

barricade yourself in / inside (sth)
躲在…里:
He had barricaded himself in his room.
他把自己关在房间里。

track sb / sth down
搜寻到；跟踪找到；追查到
The police have so far failed to track down the attacker.
警方至今未能追捕到攻击者。

assassinate sb
(尤为政治目的的)暗杀；行刺:
The prime minister was assassinated by extremists.
首相遭极端分子暗杀。