AU

中英例句：

1. It's my first week here so I'm not yet au fait with the system.
   我剛來不到一個星期，對這裡的制度還不太熟悉。
2. Au revoir, see you again next year!
   再見，明年見！
3. We've got a German au pair for six months.
   我們找到了一個可以乾六個月的德國換工。

英文解釋：

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, 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