1. 驴
A donkey is an animal which is like a horse but which is smaller and has longer ears.
2. 很久;多年
For donkey'syears means for a very long time.
e.g. I've been a vegetarian for donkey's years.
多年以来我一直是个素食者。
e.g. ...old iron mines that haven't been used in donkey's years.
废弃已久的旧铁矿
名词驴，毛驴; 笨蛋，傻瓜; （美国）民主党的象征