1.  disuse
2.  out of use
3.  out of service

• 1. 不被使用: go out of use
• 2. 不再被使用: go out of use
• 3. 不再被使用的: out of use

• 1.因此，大多数BIOS允许将不被使用的端口设置为禁用。
  For this reason, most BIOSes allow ports that are not in use to be disabled.
  dict.yoduao.com
• 2.主要优势是旧客户仍然在系统中，即使它不被使用。
  The main disadvantage is that the old client is still in the system, even though it isn't used.
  dict.yoduao.com
• 3.总准备金的增加会有多少成为超额准备金而不被使用？
  To what extent will the increase in total reserves remain unused as excessreserves?
  dict.yoduao.com

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