講解：
swear sb in | ?swear sb into sth
使某人宣誓就職；使某人宣誓忠于某組織(或國家等):
He was sworn in as president.
他宣誓就任總統。

target (for sb / sth) | ~ (of sth)
(攻擊的)目標,對象:
Doors and windows are an easy target for burglars.
門窗被竊賊作為入室的目標容易得手。

backfire (on sb)
產生事與愿違的不良(或危險)后果:
Unfortunately the plan backfired on us.
不幸的是,計劃產生了適得其反的結果。

by a margin
(獲勝者在時間或票數上領先的)幅度,差額,差數:
He won by a narrow margin.
他以微小的差額獲勝。

on the ticket
(政黨在選舉中所支持的)候選人名單:
She ran for office on the Democratic ticket.
她作為民主黨的候選人參加競選。

clamp down (on sb / sth)
嚴厲打擊(犯罪等):
A campaign by police to clamp down on street crime is underway.
警方開始了嚴厲打擊街頭犯罪的運動。