an occasion when you become more energetic and active than before

His grandchildren have given him a new lease of life. 孙子孙女让他重新变得充满活力。

an increase in the period for which something can be used or continued

The project suddenly got a new lease of life when the developers agreed to provide some more funding. 开发商们同意提供更多资金，使这个项目重新燃起了希望。