a.m.
n. a radioactive transuranic metallic element; discovered by bombarding uranium with helium atoms 同义词：americiumAmatomic number 95
a master's degree in arts and sciences 同义词：Master of ArtsMAArtium MagisterAM
modulation of the amplitude of the (radio) carrier wave 同义词：amplitude modulationAM
adj.before noon 同义词：ante meridiem
adv.before noon 同义词：ante meridiem