The phrase "are once again present" is correct and usable in written English.
It can be used to indicate that something or someone has returned or reappeared after a previous absence.
Example: "After a long hiatus, the musicians are once again present at the festival, ready to perform for their fans."
Alternatives: "are back once more" or "have returned again".
Local stalwarts Louis Koo and Simon Yam, who seem to have staffed virtually every similarly fiendishly twisty undercover-cops saga of the past couple of decades, are once again present.
In these often pink- and red-toned paintings, in which suggestive flowers are once again present, one sees surface as skin, skin as light, color as both, and everything as paint.
Call it pragmatic idealism, if you must apply a label.... [It] is possible that, to use Acheson's famous phrase, we are once again "present at the creation" of a new paradigm, one that focuses on what the United States can do for the world, not what the world can do for the United States.
The three Angels are once again presented like the vanilla, strawberry and chocolate triptych in Neapolitan ice cream: the blond Abby (Rachael Taylor), the brunette Eve (Minka Kelly) and the black Kate Anniee llonzeh).
Knox is once again present to keep files secure and is joined by a few additional privacy measures, most notably the iris scanner, which joins fingerprint sensing, pattern, password and PIN in the list of ways to unlock the phone.
Litter was once again present and changed for every trial.
Transcription factor families V$GREF (Glucocorticoid Responsive and related Elements) and V$HIFF (HIF) were once again present in the list, which is consistent with the above pathways analysis (Table 1).
With his remarks today, Mr. Bush was giving the rope a vigorous yank, and he was once again presenting himself as a Washington outsider who had come to bring a dose of sanity to an insiders' crazy game.
Hurt reprises his role and, perhaps surprisingly, Crisp is once again presented as an outsider: initially basking in an apparent idyll of self-determination, he soon finds new pressures to conform and is ostracised for crossing party lines in the gay utopia, particularly when he downplays Aids as "a fad".
There was the question of the settlements and the manner in which the issue was, once again, presented.
