名詞 au:

1. a soft yellow malleable ductile (trivalent and univalent) metallic element; occurs mainly as nuggets in rocks and alluvial deposits; does not react with most chemicals but is attacked by chlorine and aqua regia
   同義詞：gold, Au, atomic number 79
2. a unit of length used for distances within the solar system; equal to the mean distance between the Earth and the Sun (approximately 93 million miles or 150 million kilometers)
   同義詞：Astronomical Unit, AU

AUS
abbr.（略語）
Army of the United States.
美利堅合眾國軍隊