1.  seldom
2.  rarely
3.  hardly ever
4.  once in a blue moon

• 1. 不经常: Not often | Not regular | not very often
• 2. 不经常漂浮: not always afloat
• 3. 不经常漂浮但安全搁浅: not always afloat but safely aground | NAABSA

更多释义

• 1.不经常运动就更容易受伤。
  You are more liable to injury if you exercise infrequently.
  dict.yoduao.com
• 2.中国人也不经常在公共场合拥抱。
  Chinese people don't usually hug in public, either.
  dict.yoduao.com
• 3.一个月后，他发现老板不经常检查。
  After one month, he found that the boss didn't check very often.
  dict.yoduao.com

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