そんぞく存続sonzoku
1.
The act or condition of remaining in existence over a period of time, particularly concerning organizations, laws, or rights that are maintained or sustained.
2.
The ongoing presence or survival of something, such as traditions or systems, that persist despite the passage of time or changing circumstances.
3.
The effort or measures taken to ensure that a particular entity, whether tangible or abstract, continues to exist or operate.
Example:
その地方ではその古い風俗がなお存続している。