abbr. alien tax unit 外国人入境税计量单位;atomic time unit 原子时间单位
网络 收发器单元(ADSL transceiver unit); 美国理工大学(America Technology University)
But sometimes if they look atu in class it doesn´t mean that they like u.
但是有时候他们在班里看你并不表示他们喜欢你。
U are standing on the bridge, looking at the view. someone who looking at the view is looking atu.
你站在桥上看风景,看风景的人在楼上看你。