Sentence examples similar to aggregation is unavailable from inspiring English sources

Yet, the atomic structure of the αS aggregates is unavailable, making it difficult to understand the underlying aggregation mechanism.

This shows the possibilities of using non-expert knowledge aggregation techniques when expert knowledge is unavailable.

User terminal might require to perform aggregation of multiple frequency bands with different characteristics if large contiguous spectrum for sharing is unavailable.

But Lenin is unavailable.

His condition is unavailable.

Registration is unavailable.

For example, if P0 is unavailable, P1 becomes unavailable, so that P2 also becomes unavailable.

Ronda Rousey is unavailable.

Dr oz is unavailable.

"The service is unavailable".

So, how desirable is unavailable?