"prevent the appearance" is a grammatically correct phrase that can be used in written English.
It means to stop or hinder something from showing or becoming visible. Example: The sunscreen helped prevent the appearance of sunburn on her fair skin.
In addition, approximations developed prevent the appearance of various pathological (with, e.g., spurious, parasitic modes, etc).
That policy is meant to prevent the appearance of prosecutors affecting the electoral process.
It didn't prevent the appearance of a timid salad of bibb lettuce, hearts of palm and fennel.
Even so, they will be unable to prevent the appearance of one uninvited and most undesirable group: wood ticks.
The minister said Hungary wanted to "prevent the appearance of not willing to comply with obligations it took on".
This study provides the initial insights of how to optimize the flow and prevent the appearance of a capillary ridge and fingering instability.
Mark Wefers, the student president, said today that the trustees' decision that an after noon meeting be held might prevent the appearance.
Neutralization of TNF-α or prior depletion of macrophages were able to prevent the appearance of apoptosis of hepatocytes in poly I C-challenged RI C-challengede.
"Of the 12,000 bridges in the network, a third need repairs … often small repairs in order to prevent the appearance of structural deterioration," it said.
So ministers escaped censure despite the fact that the exam boards had been given to understand that the highest grades must be lowered to prevent the appearance of grade inflation – a clear instance of political interference in the examination process.
Once he became the President's point person on Iraq, Biden had to stop talking up the federal plan, to prevent the appearance that the White House wanted to neuter the government in Baghdad.
