The phrase "allow the appearance of" is correct and usable in written English.
It can be used when discussing the facilitation or acceptance of something being visible or noticeable, often in a context where perception is important.
Example: "The new policy aims to allow the appearance of transparency in the decision-making process."
Alternatives: "permit the visibility of" or "facilitate the emergence of".
NATO cannot allow the appearance of a major concession.
In our model, we allow the appearance of two types of carryovers (residuals) in the observations collected in the second period.
We considered whether the number of unstable divisions during the extended proliferation period available to the explants might have generated sufficient variation to allow the appearance of mutant clones resistant to the effect of our knockdowns.
It may be that, just as some points of the liturgy call for a literal silence, the intelligible contemplation of the hierarch at the altar must engage in its own form of silence, so as to allow the appearance of the godhead beyond naming.
We cannot risk analysis paralysis, or, perhaps worse, allow the appearance of debate or political lethargy to substitute for change.
In this context, the replication cost saved would allow the appearance of more and longer functional peptides and, finally, proteins.
A system with realistic dynamic properties is used and submitted to a large number of conditions of use, allowing the appearance of a wide diversity of responses.
The press prohibition had been annulled in 1904, allowing the appearance of the first Lithuanian daily newspaper, Vilniaus žinios ("Vilnius News").
The application of nanotechnology strategies in oncology has revolutionized the transport of drugs to cancer, allowing the appearance of new treatments with an improved specificity.
A more disturbing aspect of the changes, though, is the prospect that many children could lose their care altogether because of the formula the agency is using to determine need — one that allows the appearance of affluence to obscure necessity.
Perhaps it's just as well that Iranians are adept at something they call ta'arof, a form of ritual politeness that allows the appearance of good manners without revealing the true feelings behind them.
