Sent_en: 2zh The 2000 redistricting rules for the 2012 elections mandated that Detroit 's two congressional districts must be 60 percent black voters , since four out of five of Detroit 's residents are black .
Sent_yy: 根据2000年规定的2012年选举重新划分规则，底特律的两个国会选区必须有百分之60的黑人选民，因为底特律五分之四的居民是黑人。