Sentence examples for reason is unclear from inspiring English sources

The reason is unclear.

The implication is that now Odette will not remain a swan, but the reason is unclear.

For example, in November, there was actually a decrease in infiltration from North Waziristan, although the reason is unclear.

The reason is unclear, but some scientists think it may involve the unusually heavy rains or the warmer air and water temperatures.

The reason is unclear, but the scientists suggest that individual mothers respond differently to their own infant's face, with some feeling distress and others inhibiting the negative emotion.

The exact reason is unclear, but whatever kept the miners out provided the anti-textbook movement with enough power to force concessions.

The reason was unclear.

The opposite was true for men, though the reason was unclear.

Researchers, writing in The Lancet Oncology, said the reason was unclear.

The reasons are unclear.

The reasons are unclear; some studies found no link.