This insurance is designed to fill a gap in welfare provision.这种保险就是为了填补福利服务没有覆盖的空白点。These new discoveries will help to fill a gap in our knowledge of how the human body ages.这些新发现将有助于填补我们关于人体衰老这方面知识的空白。The company is hoping to fill a gap in the market.公司希望填补市场上的空缺。