The phrase "has been expounding" is correct and usable in written English.
It is used to indicate that something has been explained in detail. For example, "The professor has been expounding on the history of European politics for the past two hours."
The richness of the structure tensor model has been expounded in [7].
A more moderate conception has been expounded by Thomas Nagel, which holds that the mind body problem is currently unsolvable at the present stage of scientific development and that it might take a future scientific paradigm shift or revolution to bridge the explanatory gap.
The identification of novel miRNA has been expounded in another article [ 32].
The basic idea that the immune system is capable of recognising and responding to cancer has been expounded for over 150 years, with early speculation that the incidence of cancer would be much greater were it not for the ability of the immune system to identify and eliminate nascent tumour cells.
For much of the ride from Yaoundé, Wolfe had been expounding upon the health dangers posed by bushmeat, the common term for tropical wild game, which includes monkeys, gorillas, chimpanzees, porcupines, scaly anteaters, cane rats, and other animals.
PAGE 17 REAL REBUILDING IN IRAQ It appears that some of the lessons that reconstruction watchdogs have been expounding on for years are being taken to heart in Iraq.
This is our programme, the benefits of which have been expounded in many places recently.
Thus, they are understood not as an appearance of the saint but only as a visualization of the holy persons for the support of recollecting spiritual meanings that have been expounded intellectually through sermons.
Apparently he also "borrowed without generating any ill feeling" the concept of the "multiplier", one of those ideas which seem obvious after they have been expounded by a person of genius.
Various theories for the decline have been expounded: from the assertion that the trend is symptomatic of all membership-based organisations (ie nothing can be done), to the observation that the fall is contiguous with the systematic diminution of membership rights and privileges (ie something can be done).
