narrowbase

例句：

1. 1. The company's financial performance has been severely affected by the recent economic downturn.
   该公司最近经济不景气，其财务表现受到严重影响。
2. 2. The project requires a narrow base to ensure its success.
   该项目需要有一个狭窄的基础以确保成功。
3. 3. The researcher found that the narrow base of the virus could be a potential target for drug development.
   研究者发现病毒的狭窄基础可能是药物开发的潜在目标。