The phrase "are infrequently seen" is correct and usable in written English.
It can be used to describe something that does not appear often or is rarely observed.
Example: "These rare birds are infrequently seen in this region, making them a special sight for birdwatchers."
Alternatives: "are rarely observed" or "are seldom encountered".
Once common on both slopes of Mexico, Wild Turkeys are infrequently seen there victims of hunting and habitat loss.
Most chimeras in the modern biota live in deep ocean waters and are of limited economic importance, so they are infrequently seen by the general public.
Hunter is a young playwright and his play is clumsily organized; nonetheless he challenges himself with a number of fascinating characters who are infrequently seen on the stage: a bad mother, a hate-filled child, and Charlie, who is eating himself into oblivion.
Some of the other works in the series (Cheryl Dunye's "The Watermelon Woman," from 1996, known for being the first feature film directed by a black lesbian woman; "Compensation," from 1999, directed by Zeinabu Irene Davis) are infrequently seen but seminal pieces of black cinematic history.
While Mr. Cardona, a Bessie-award-winning choreographer, has made a name for himself with large-scale works that incorporate a multitude of objects, Ms. Lacey is a visionary whose works are infrequently seen in New York and are much missed.
Though Manchester United is considered the most valuable sports franchise in the world and continues to bring in record revenue, the fact that the Glazers are infrequently seen at home games has led some fans to assume the owners are in such distress that they are unwilling to show their faces.
Features such as dysmorphisms and skeletal problems are variably associated with AR HIES, while pneumatocele formation was infrequently seen in patients with DOCK8- or TYK2-mutations [ 20].
Severe adolescent idiopathic scoliosis with respiratory insufficiency is infrequently seen in North America currently.
The first lineage, GN1, was largely restricted to Guinea and was infrequently seen in Sierra Leone.
Mr. Preljocaj is the best known of the bunch, but even his work is infrequently seen in New York.
As for whether Mapplethorpe's most explicit images, which have been infrequently seen in major American museum shows over the last two decades, would cause a new stir at Lacma, Mr. Govan said he doubted it.
