def crawDailyDescriptContext(linkUrl):
startContext = SilverMetalNetSpiderUtils.returnStartContext(linkUrl,'<div class="zhaiyao">')
startContext = SilverMetalNetSpiderUtils.filterAfterContext(startContext,'<span class="intro">')
filterContext =SilverMetalNetSpiderUtils.filterContextByTarget(startContext,'', '</span>')
filterContext =SilverMetalNetSpiderUtils.removeSpecialCharacter(filterContext)
return filterContext
