The phrase "are further underlined" is correct and usable in written English.
It can be used when indicating that something has been emphasized or highlighted in addition to previous emphasis.
Example: "The key points in the report are further underlined to ensure clarity and understanding."
Alternatives: "are additionally emphasized" or "are further highlighted".
These findings are further underlined by the higher prevalence of these conditions in this hospital based COPD cohort, when compared to age and gender matched general population.
These complexities are further underlined by the findings in multiple preclinical studies that acidosis may have direct effects which can protect cells and organs in the setting of acute organ injury.
These issues are further underlined by the fact that hypercapnia has potentially severe adverse effects in some clinical settings, such as critically elevated intracranial pressure or pulmonary vascular resistance.
In addition, there is a lack of reliable data on capacity for health research as well as limited knowledge about where the real bottlenecks are, further underlining the need for more institutional, systems and capacity evaluation [ 15].
We call for competitiveness to be further underlined by the market.
But the scale of the unemployment crisis was further underlined by logistics giant Wincanton, which is cutting 1,000 jobs, while the administrators running Waterford Wedgwood announced 367 redundancies.
Contrast such excitement and captivation with the nature of the New York Red Bulls' semi-final tie, and the Crew's standing as MLS's entertainers-in-chief is further underlined.
The huge impact of the attacks on the American psyche was further underlined last night as New York's biggest broadsheet, the New York Times, picked up an unprecedented seven awards.
The worsening age divide in Britain's economy is further underlined by a separate study from the London School of Economics which shows that low wages are only part of the picture, and younger workers lag far behind in wealth, too.
Hidden Figures' box office sturdiness – perhaps fuelled by the Martin Luther King holiday weekend – was further underlined by the underwhelming performance of a number of high-profile expanding films, which added large numbers of screens but little in the way of receipts.
The nature of the threat was further underlined on Monday when a senior politician in Borno admitted that civil life in the state, home to three million people, has all but ground to a halt.
