奥巴马宣布就中国对美国生产的汽车征收关税一事向世贸组织提出了申诉

U.S. President Barack Obama says his government will fight to hold China accountable for practices harming American automakers.

Speaking at a campaign stop near  Toledo, Ohio Thursday, Mr. Obama said Americans need a "fair playing field." He announced a new complaint with the World Trade Organization on more than $3 billion in allegedly unfair Chinese duties on American-made cars.

Toledo is home to a big auto plant complex. Mr. Obama told the crowd that six previous WTO challenges to China have been successful.

Mr. Obama is spending Thursday and Friday in Ohio and Pennsylvania, two crucial states in the November general election.

He carried both in the 2008 election, and recent opinion polls show him holding a narrow lead over his Republican opponent, Mitt Romney. The president will use the campaign swing to portray himself as a champion of average, working-class Americans, and to portray Romney as a wealthy businessman before he entered politics.

奥巴马在俄亥俄州的托莱多小镇附近做竞选演讲时表示，美国人民需要“一个公平竞争的环境”。星期四，奥巴马宣布就中国对美国生产的汽车征收30多亿美元新关税一事向世贸组织提出了申诉。

托莱多是一个大型汽车制造厂的所在地。奥巴马对听他演讲的民众说，以往美国曾经六次向世贸组织提出针对中国的申诉，都获得了成功。

奥巴马将于星期四和星期五在俄亥俄州和宾夕法尼亚州进行竞选活动，这两个州对11月的总统大选十分关键。

2008年大选中，奥巴马在这两个州都赢得了胜利，最近的民意测验显示，他在这两个州以微弱优势领先于他的共和党竞争对手罗姆尼。奥巴马意欲借助这次竞选巡访凸显他是普通民众和工薪阶层更理想的代言人并将自己与从政前就已是富商的罗姆尼进行对比。