a fundamental difference between their aims他们目标的根本差异
2. 重要的
a fundamental cause of his success他成功的重要原因
3. 必要的
Fresh air is fundamental to good health.空气新鲜是身体健康之必需。
4. 本性的
n.原理；原则；基本
A fundamental of good behavior is consideration for others.良好行为的一个根本是体谅他人。
If the young boys and girls are going to camp for two weeks by themselves, they'll need to know the fundamentals of taking of themselves.孩子们如果要靠自己出去野营两个星期，便须懂得照顾自己的基本知识。