年輪

1. Origins, structure, and basic meaning

• Structure: 年輪(ねんりん) means a growth ring visible in a tree's cross-section.
• Basic usage: It serves as an indication of a tree's approximate age and as a metaphor for a person's accumulated experience.

2. Common pitfalls and similar expressions

• The human metaphor of accumulated experience
  • 長い経験の年輪 figuratively presents experience as layers built up over time. In the example about calm speech, it conveys the depth of accumulated experience rather than simply a numerical age.