in a way that can continue over a period of time

They were aiming for sustainably higher rates of pay for all their employees. 他们的目标是可以持续提高所有员工的工资水平。

in a way that causes little or no damage to the environment and therefore able to continue for a long time

The article is full of hints on how to live sustainably. 关于如何实现对环境影响极小的可持续生活，这篇文章里有很多提示。