Billionaire real estate mogul Donald Trump continues to lead the crowded field of U.S. Republican presidential candidates, according to a new CBS News survey. Former Secretary of State Hillary Clinton has a substantial lead in the race for the Democratic nomination._______________________________________________________________In Washington, I'm Dave DeForest. That's the latest world news from VOA. 最新哥伦比亚广播新闻调查显示,房地产大亨,亿万富翁唐纳德.特朗普在美国共和党总统侯选人的竞选中保持领先.而前国务卿希拉里.克林顿则在民主党的提名中遥遥领先.___________________________________________________以上便是最新美国之音国际新闻,戴夫.德福雷斯特华盛顿报道.