Definition: Something that is irreversible cannot be changed back to how it was before. Level: C2
吸烟对他的肺部造成了不可逆的损伤。
Smoking has caused ___irreversible damage to his lungs.
重要的是要记住，任何事做得过度都可能产生不可逆的后果！
It is important to remember that everything done excessively can have ___irreversible consequences!
关闭工厂的决定是不可逆的。
The decision to close the factory is ___irreversible.
