Sentence examples for cause is unclear from inspiring English sources

The cause is unclear.

Its primary cause is unclear.

Whether the rats die from massive heat loss, infection or other cause is unclear.

Close planting often increases the lodging rate of maize, but the cause is unclear.

Lacrimal sac dacryoliths are often diagnosed during dacryocystorhinostomy (DCR), although their cause is unclear.

The higher rates of adverse outcomes in young women were surprising, and the cause is unclear, says Dr. Friedman.

But in the other cases, the cause was unclear.

The cause was unclear but appeared to be an explosives cache.

One of those women later died, though the cause was unclear.

The cause was unclear; the two men evidently had discussed the matter over the telephone.

The USS Maine exploded in Havana harbor in February 1898, and though the cause was unclear, popular opinion blamed Spain.