熟練

1. Origins, structure, and basic meaning

• Structure: 熟練, read じゅくれん, combines thorough familiarity with repeated practice.
• Basic usage: It denotes skill or proficiency acquired through sustained experience and practice.

2. Common pitfalls and similar expressions

• Modification with 熟練した
  • 熟練した職人 describes an artisan who has acquired proficiency; it does not merely state how long the person has worked.
• Abstract noun use
  • In 熟練が必要だ, the word names the skill itself as a requirement for the task.