permanent expansion

例句：

1. 1. The company's annual growth rate has been persistently high.
   该公司的年增长率一直很高。
2. 2. The government is committed to promoting sustainable development and preventing environmental degradation.
   政府致力于促进可持续发展，防止环境退化。
3. 3. The economy is expanding at a pace that will not be sustained in the long term.
   经济正在以无法长期维持的速度扩张。