The campaign is trying to make up ground by advertising heavily in key states.这项活动旨在通过在主要的州大做广告来占领市场。Both candidates have been campaigning in key battleground states.两位候选人都一直在竞争激烈的关键州进行竞选宣传。The company has developed sales through local agents in key markets.该公司通过当地的代理商增加了在主要市场的销售。