Definition: Something that is unsustainable cannot continue at the same rate. Level: C2
养老金支出水平是不可持续的。
The level of spending on pensions is ___unsustainable.
当前的经济增长模式长期来看是不可持续的。
Current economic growth models are ___unsustainable in the long term.
如此高的污染水平对我们的星球来说是不可持续的。
Such high levels of pollution are ___unsustainable for our planet.
