"they performed with great polish"
"I admired the exquisite refinement of his prose"
"almost an inspiration which gives to all work that finish which is almost art"
"he described a refinement of this technique"
"without understanding the finer nuances you can't enjoy the humor"
"don't argue about shades of meaning"
"a man of intellectual refinement"
"he is remembered for his generosity and civilization"
Many pages contain subtle modifications and refinements.