"underscores the necessity" is a correct and usable phrase in written English.
You can use it to emphasize the importance or urgency of something. For example, "Her passionate speech underscores the necessity of investing in education."
"This major development underscores the necessity and urgency of international mobilization," he said.
The events of the past 24 hours underscores the necessity of remaining vigilant against terrorism.
Second, it underscores the necessity of institutionalizing a deliberative administrative process within the agency concerning the harm.
That anyone would find the video appropriate underscores the necessity of accurate conversations about the realities of chattel slavery.
She said: "The disruption of this IED plot underscores the necessity of remaining vigilant against terrorism here and abroad.
This underscores the necessity to investigate the circuit dysfunctions in treatment-resistant depression, and how they are modified by treatment.
"The events of the past 24 hours underscores the necessity of remaining vigilant against terrorism," Mr. Obama said.
The study also underscores the necessity of building a government-led multi-agent housing provision system in China to enable rural migrants to permanently settle down in cities.
"The competitive environment underscores the necessity of US Airways becoming a part of a larger network," its chairman, Stephen M. Wolf, said in a statement.
She added: "The disruption of this IED [improvised explosive device] plot underscores the necessity of remaining vigilant against terrorism here and abroad".
The large number of U.S. service members diagnosed with concussion/mild traumatic brain injury each year underscores the necessity for clear and effective clinical guidance for managing concussion.
