Whilst formal and nonformal adult education seem to be distinctively clarified, informal adult education is an even emerging sector within the discussion about adult education and educational policy.

• 当正规与非正规成人敎育似乎能够被清楚区别时，非正式成人敎育便成为了成人敎育与敎育政策中的一个重要新兴讨论面向。