N-UNCOUNT
（为使某一党获得优势）不公正的改划选区
Gerrymandering is the act of altering political boundaries in order to give an unfair advantage to one political party or group of people.
例句
With the help of skilful gerrymandering, the Party has never lost an election since.
这个政党通过巧妙地改划选区而使此后的选举无往不胜。