Residual is known as unavailable state, which is not easily released.

残渣态一般称为非有效态，不易释放出来。

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The major state of a new link is initially set to unavailable (una).

一个新链路的主要状态最初设置为不可用(una)。

youdao

However, if the authentication server is unavailable, the event handler returns the application to the offline state.

但是，如果身份验证服务器不可用，则事件处理程序会使应用程序重新恢复为脱机状态。

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Stephens was forced to use newspaper obituaries for the study because state vital statistics were unavailable to him at the time.

CNN: Doctor's free clinic a 'tiny Band-Aid' to pain of Katrina

Of course, the state's star witness, Trayvon Martin, is unavailable to them.

CNN: Should George Zimmerman be prosecuted?