mellowing
['meloʊrɪŋ]
n.
软化，醇化;
v.
（使）成熟( mellow的现在分词 );
使色彩更加柔和，使酒更加醇香;
例句:
-
Sticking small needles into the hammer's felt creates mellowing.
在琴槌的毛毡上粘上小针以使音色圆润.
-
I'm mellowing out in my impending middle age.
来自THETIMES
-
Whatever the nomenclature, barley wines are strong enough to last years without turning sour; most benefit from a mellowing rest.
来自WSJ