The phrase "are often enclosed" is correct and usable in written English.
It can be used when describing items or information that are typically contained within a boundary or limits, such as brackets, parentheses, or other forms of enclosure.
Example: "In mathematical expressions, variables are often enclosed in parentheses to indicate the order of operations."
Alternatives: "are frequently contained" or "are commonly surrounded".
Aluminum wire is often used for trimming; other materials, such as calcium-silicon, zirconium, and rare-earth metals, are often enclosed in thin steel tubes and are fed by the same machines.
In many leafy liverworts the archegonia are often enclosed by a protective sleeve, the perianth, and have mucilage hairs among them with a function similar to that of the paraphyses of mosses.
Darwin described in detail the rock and collected various samples of "gneiss, abounding with garnets, and porphyritic with large crystals, even three and four inches in length, of orthoclase feldspar: in these crystals, mica and garnets are often enclosed". Feldspar-augen-gneiss from the Pão de Açúcar/Sugarloaf Mountain in Rio de Jainero.
Smaller interior buildings are often enclosed by these huge peripheral walls which can contain halls, storehouses, wells and living areas.
In this region, cows are usually kept in open corrals adjacent to human dwellings while goats are often enclosed in more distant corrals constructed with adobe blocks.
The body of the uli, like that of the malanggan, is often enclosed in sweeping bands.
Their ritual use is most notable in ancient Egypt, where the mummies of important persons were often enclosed in several human-shaped coffins and then deposited in large, rectangular wooden coffins or stone sarcophagi.
By far, the most popular tourist activities on the Great Barrier Reef are snorkelling and diving, for which pontoons are often used, and the area is often enclosed by nets.
This is located under retained earnings and is often enclosed in parenthesis.
Both Hirano bodies found in humans and model Hirano bodies are often seen enclosed in membranes thought to be derived from autophagosomes [ 12, 22].
Revisions are often numbered and enclosed within a triangle, octagon, circle or other consistent symbol.
