The phrase "are frequently distinguished" is correct and usable in written English.
It can be used when discussing how certain items, concepts, or categories are often recognized as different from one another.
Example: "In the study of linguistics, dialects and accents are frequently distinguished based on their phonetic characteristics."
Alternatives: "are often differentiated" or "are commonly recognized as distinct".
But the book is frequently distinguished and challenging, and it was thus a surprise when Oprah Winfrey, not previously known for her taste in big postmodern novels, chose it for her televisual "book club".
Cozzi products, often freely adapted versions of Meissen porcelain, consisted mainly of figures, vases, and tablewares with Rococo decoration that was frequently distinguished by an imaginative interpretation wholly Italian in style.
At that time, the positions were frequently distinguished as belonging in one or the other of two groups, alternatively labeled cognitive and non-cognitive (Godlovitch 1994, Eaton 1998, Carlson and Berleant 2004), conceptual and non-conceptual (Moore 1999), or narrative and ambient (Foster 1998).
In the cities of developing countries, formal areas characterized by adequate spatial planning and utilities (water, electricity, telephone, road infrastructure) and informal areas with no urban development could be frequently distinguished [ 12].
Very often, these issues are couched in terms of "freedom" instead of (or together with) "responsibility"; indeed, as Kane (2002: 4 5) observes, the issues are frequently not sharply distinguished.
Screening tools based on verbal pain descriptors and pain qualities are frequently used to distinguish NP from other types of chronic pain [ 18].
Blood and urinary indices are frequently used to distinguish a transient, reversible decline in kidney function, from a persistent, structural kidney impairment (generally attributed to acute tubular necrosis (ATN)).
But Kazan's direction was more frequently distinguished by the shyness and uncertainty he revealed in his performers, who often seem to be turning away from the audience and into themselves.
Based on the premise that benign lymph node enlargements are frequently detected after CRT, we must distinguish recurrences from simple enlargements using non-invasive modality.
