扇形区

例句：

1. 1. The company's performance in the first quarter was disappointing, with a sector of its sales falling short of expectations.
   该公司第一季度的表现令人失望，其中一部分销售未能达到预期。
2. 2. The economist predicted that the economy would enter a sector of recovery after the recession.
   这位经济学家预测，在经济衰退之后，经济将进入复苏的一段时期。
3. 3. The research team focused on the sector of the population most at risk for disease.
   研究团队专注于最有可能患病的人口群体。