instruction:
In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.
question:
The National Security Advisor , officially known as the Assistant to the President for National Security Affairs , serves as the top advisor to the President of the United States on national security issues .
answer:
The Assistant to the President for National Security Affairs ( APNSA ) , commonly referred to as the National Security Advisor ( NSA ) or at times informally termed the NSC Advisor , is a senior aide in the Executive Office of the President , based at the West Wing of the White House , who serves as the chief in-house advisor to the President of the United States on national security issues .


question:
The palace gives its name — Whitehall — to the road on which many of the buildings of the UK government now stand .
answer:
The palace gives its name , Whitehall , to the street on which many of the current administrative buildings of the present-day British government are situated , and hence metonymically to the central government itself .


question:
As luminosity of stars increases greatly with mass , the luminosity of hypergiants often lies very close to the Eddington limit .
answer:

As the luminosity of stars increases greatly with mass , the luminosity of hypergiants often lies very close to the Eddington limit , which is the luminosity at which the radiation pressure expanding the star outward equals the force of the star 's gravity collapsing the star inward .


