1.  seldom
2.  seldomness

• 1. 不常: seldom | rarely | not often | seldomness
• 2. 好景不常: The morning sun never lasts a day | Good Things | All Good Things | Morning Glory
• 3. 不常碰到或发现的: few and far between | few and distant between | few and far among | few and distant among

更多释义

• 1.记忆力不常使用就会衰退。
  Memory can atrophy through lack of use.
  dict.yoduao.com
• 2.我周末大多都能见到她，但平时不常见到。
  I see her most weekends but not very often in between.
  dict.yoduao.com
• 3.幸运的是，年轻妇女患乳腺癌的情况不常见。
  Fortunately, cancer of the breast in young women is uncommon.
  dict.yoduao.com

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