The phrase "also explained that certain" is correct and usable in written English.
It can be used when providing additional information or clarification about specific topics or items that have been previously mentioned.
Example: "The researcher also explained that certain factors could influence the results of the study."
Alternatives: "further clarified that specific" or "additionally stated that particular".
This also explains that certain biochar bulk composition measurements such as the elemental analysis and FTIR-ATR (Fourier Transformed infrared resonance-attenuated total reflection spectroscopy utilizing a Shimadzu IRPrestige-21 FTIR spectrometer) measurements could hardly detect the change brought about by ozone treatments.
Although there are instances where certain narrations would abrogate the other, Al-Shafi'i also explains that would usually be clear evidences in that narration indicating such abrogation.
The complexion not only disposed a person toward certain physical and mental characteristics, but also explained that person's susceptibility to certain diseases; it could become "unnatural" either by corruption or by an excess or deficiency of one or more humors and their qualities.
(Young woman FGD 5) The community also explained that in the past they used to believe that eating certain foods such as eggs was detrimental to the unborn foetus.
He also explained that unemployment can be caused by people's inability to access certain networks.
But I also explained that doubling pre-industrial carbon dioxide concentrations, which we are almost certain to do now, was just the beginning.
Whisson also explained that koalas are difficult to relocate because they tend to specialize in certain tree species.
Tumblr's post muddies the current issue of adult and NSFW content not showing up in search results by also explaining that on certain mobile platforms, search works differently.
He also explains that the mass media don't qualify as an emergent system; they lack a feedback mechanism to prevent certain stories (like O. J. or Princess Diana's death) from spinning out of control, saturating the airwaves for months.
In Vienna, she explained: "That was obviously meant for certain politicians whom we all know".
