备用房间 meaning in English

a spare room
spare room

I intend to clean out the spare room sooner or later
我打算迟早要清理一下这个备用房间。
For example , doug lea s talk on concurrency utilities - one of the most popular sessions last year it had previously filled both a large session room and an overflow room - was booked into one of the smallest session rooms , with no overflow facilities available
例如， doug lea关于并发实用程序的演讲- -去年最流行的研讨会之一(它以前装满了一个大会议室和一个备用房间) - -预订了一间最小的会议室，而且没有任何备用房间。