The phrase "not yet perfectly" is correct and usable in written English.
You can use it to describe something that has not yet been achieved to its fullest potential or is not yet at its best. For example, "She has mastered the technique, but not yet perfectly."
As he puts it, there are values, such as equal citizenship, accountability or the rule of law, that are reflected (albeit not yet perfectly) in western democracy but can also be expressed in ways that are closer to Islam's history and culture.
Automatic target recognition (ATR) in target search phase is very challenging because the target range and mobility are not yet perfectly known, which results in delay-Doppler uncertainty.
However, automatic speech recognition (ASR) is known to be a challenge for the recognition of children's speech [4 8]: characteristics of both acoustics and linguistics differ from those of adults [9], for example, by higher pitch and formant positions or not yet perfectly developed coarticulation.
Greg Sandow of Entertainment Weekly gave I'm Breathless an A rating, prasing Madonna for "invent[ing] a new Broadway vocal persona, built around a chest voice not yet perfectly under control but still much richer and duskier than her low range sounded before".
However, the combination of economic, social, biological, and behavioural factors that increase adolescent girls' sexual vulnerability in times of war and render them disproportionately susceptible to HIV/AIDS is not yet perfectly understood.
Part of the problem has been radiologic techniques are not yet sufficient to perfectly define tumor number and size and will never be able to determine microscopic vascular invasion.
Bebo's platform is up-to-speed with Facebook's platform as it was six weeks ago, so it does not yet mirror Facebook's platform perfectly (and Bebo will need to continually work on it in an effort to keep matching Facebook).
While Don Banks argues on SI.com that while the league is not yet dealing with in-game concussions perfectly, the three over the weekend represent a sort of progress.
Although telescopes are not yet sensitive enough to analyse the atmospheres of remote exoplanets, they are perfectly adequate to the task of analysing Venus's.
The answer should be that this is not yet known – and that, in the interim, patients should be highly if not perfectly adherent.
McGruder is not yet thirty, and already he is jaded, content to settle for the kind of perfectly passable work he so often eviscerates others for.
