民调显示, "The crisis on Wall Street is boosting support for Obama in key battleground states," 华尔街危机推动了奥巴马在主要“战场州”的支持率。 "Virginia, a traditionally conservative state, has become a key battleground," 传统上一直属于保守派阵地的维吉尼亚州这次大选变成了“主要战场之一”。好的,今天我们学习的词是battleground...