A register may be unavailable if its value cannot be determined for the given situation.
如果在给定情况下无法确定某个寄存器的值，则表明该寄存器可能不可用。
The extra space they require may be unavailable or excessive within the overall product package.
它们需要额外的空间可以是整体的产品包装内不可用或过量。
If a copy becomes unavailable, then work can simply be shifted to other copies.
如果一个副本变得不可用，那么只需将工作转移到其他副本。
XXXXXX is currently unavailable due to system maintenance, we will be back soon.
有没有让用户看了更明白的信息？系统正在维护中，很快回来！
XXXXXX is currently unavailable due to system maintenance, we will be back soon.
有没有让用户看了更明白的信息？系统正在维护中，很快回来！
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