Sentence examples for origin are unknown from inspiring English sources

However, is function as well as its origin are unknown.

Its origin is unknown.

Their precise origin is unknown.

Oxford also tells us, unhelpfully, that the origin is unknown.

"The real origin is unknown, but Parnell is involved.

In practice, the tests would be used on tumors whose origin is unknown.

Their precise origin is unknown, but they probably were manufactured in the Mediterranean.

Its origin is unknown, although many unsubstantiated theories have been offered.

The county's legal origin is unknown, but historical county documents date to 1659.

As for "Bubba," it is a kind of generic nickname bestowed because part of the plant's origin is unknown.

The county has been in existence since about 1668, though the exact date of origin is unknown.