_________ environmental damage is done, it takes many years for the ecosystem (生态系统) to recover.
举一反三
- Once environmental damage ______, it takes many years for the system to recover.
- ______ the damage is done, it will take many years for the farmland to recover.
- Because of the increasing environmental damage, many countries are now under_________various new environmental protection projects.
- It can take many years to recover ______ the death of a loved one.
- 中国大学MOOC: It takes many years for people _____ the knowledge on how to be a true man.