The phrase "remained substantial" is correct and can be use in written English.
It means that something has continued to be sizable or significant. Example: Despite facing financial difficulties, the company's profits remained substantial due to their successful marketing strategies.
He said there was no change to the UK terror threat level, which remained "substantial".
The gap between the control and treatment groups closed by about half after 10 days, but remained substantial, Coppock noted.
ICANN's commitment to the openness of access to most public meetings has remained substantial, though not at a constant level.
The BBC's lead remained substantial at 10.3% but was down from 12.4% in the first three months of the year.
Unexpectedly for a reportedly glucose-dependent cell, there remained substantial OCR following the disruption of glucose metabolism.
Notwithstanding, differences between data sources remained substantial in strata where the observer sampled even after considering rarity.
Mr. Clinton, who spoke in a hoarse voice, said the two sides had made an "intensive effort" and though the gaps remained "substantial," there "has been progress".
"Conditions in both short and long-term funding markets were still far from normal in August 2010, and funding challenges for some banks remained substantial," the report said.
For those achieving a good level of development, the gender gap has reduced from 16.3 percentage points in 2014 to 15.6 percentage points this year, but early years experts warned that it remained "substantial" and have called for action to alter the trend.
The NCA said profit margins in the drugs trade remained "substantial" despite international efforts.
Under the successor kingdoms and even — though to a lesser degree — under Rome, there remained substantial room for important political engagement locally.
