Adjective:

1. in a dispute or confrontation;

   "Sam and his parents were at loggerheads over the question of car privileges"
   

atprep.在；向；达n.基普(老挝货币基本单位)(=att)；[化]砹(极不稳定放射性元素)abbr.密封的(=airtight)abbr.气温(=air temperature)Atoian阿托扬

1. The two tribes were long at feud with each other.
   这两个部族长期不和。
2. It is unnatural for sisters go be at variance.
   姐妹之间不和是不近人情的。