"keep at an acceptable level" is a grammatically correct phrase and it is commonly used in written English.
It is used to indicate that something should be maintained or controlled at a certain level that is considered acceptable or desirable. Example: The company must find a way to keep their expenses at an acceptable level to avoid overspending.
HENDRIK HERTZBERG: If casualties can be kept at an "acceptable" level and the economy is on the upswing, then it'll be a sidebar.
If the reduction of cluster purity keeps at an acceptable level of λ after adding a data point, then add the data point into the cluster.
However, by restricting the attention to sites or forums that through automated content analysis or prior knowledge are known to contain content related to violent extremism, false positives can most likely be kept at an acceptable level.
By applying e.g. a fed-batch mode of substrate addition with proper feed protocol and control variables, the levels of inhibitors can be kept at an acceptable level.
The rapid elimination of the S. Infantis infection, as well as of other bovine salmonella infections, in the late 1990s indicates that by correct control measures the infection can be eradicated or kept at an acceptable level.
So the president's reassurances have been enough to keep criticism at an acceptable level for the White House.
Expected increases in pluvial flooding, due to climatic changes, require large investments in the retrofitting of cities to keep damage at an acceptable level.
More recently, a continuous consistency model [43] is proposed for replicated services which allows bounded inconsistency and uses anti-entropy algorithms [28, 29] to keep it at an acceptable level.
For example, winter maintenance aims to keep friction at an acceptable level and there are heavy vehicles in real traffic that may wear snow or ice more quickly than cars but may also polish icy road surfaces.
Only pituitary located at anterior margin, was kept to an acceptable level.
It remains to be seen whether Mr. Maliki will be able to keep violence to an acceptable level.
