invalidate

• 1. 使作废: invalidate | Cause annulment to | To annul or make void | to discard,to abandon,to invalidate
• 2. 使无效使作废使无价值: invalidate
• 3. 使合同作废: void a contract

• 1.使废除或使无效；使作废。
  To annul or make void; invalidate.
  dict.yoduao.com
• 2.如果知道用户使用完了会话，可以使容器不再处理它并使它作废。
  If you know that the user is done with the session, save the container the work and invalidate it.
  dict.yoduao.com
• 3.不过，这个预算没有假定明年之后再为伊拉克和阿富汗战争追加经费，同时也使许多布什实行的创记录的减税项目期满作废。
  But it assumes no additional spending for wars in Iraq and Afghanistan after next year and allows many of the President's record tax cuts to expire.
  dict.yoduao.com

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