1.  invalid
2.  void
3.  null and void
4.  ineffective
5.  nullify
6.  to no avail
7.  of no avail
8.  nullity
9.  in vain
10. unavailability
11. ineffectiveness
12. inefficiency
13. futility

• 1. 无效: Invalid | in vain | null and void | disable
• 2. 无效供给: ineffective supply | ineffective supply
• 3. 无效的: null and void | invalid | void | null

更多释义

• 1.持无效证件的人被驱逐到别国。
  People with invalid papers are deported to another country.
  dict.yoduao.com
• 2.审判被终止了，其结果被宣布无效。
  The trial was stopped and the results declared invalid.
  dict.yoduao.com
• 3.原来的选举被前军事首领宣布为无效。
  The original elections were declared void by the former military ruler.
  dict.yoduao.com

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