1.  long-term
2.  long-range
3.  perennial
4.  standing
5.  timeless

• 1. 长期的: long-term | long-range | long period | extended
• 2. 长期的合作关系: long-standing relationship | standing relationship
• 3. 长期的合同: Standing agreement

更多释义

• 1.长期的经济前景已有所改善。
  Long-term prospects for the economy have improved.
  dict.yoduao.com
• 2.他们同偏见与无知进行了长期的斗争。
  They fought a long battle against prejudice and ignorance.
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• 3.她默默忍受长期的病痛。
  She endured her long illness with stoicism.
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