external rubber

例句：

1. 1. The company'sheadquarters are located in the external area ofthe city.
   公司的总部位于城市的外围区域。
2. 2.The research team is working on an externalproject that could have a significant impact.
   研究团队正在从事一个可能产生重大影响的外部项目。
3. 3. The new building is designed tobe externally accessible and internally efficient.
   这座新建筑设计为外部可进入，内部高效。