I'm not going to let anyone else's opinion of me define who I am.
When you’re good at something, make that everything.
The concept of legal obligation is central to the understanding of law.
采矿业的可持续性不是一种选择，而是我们对后代的责任。
检验统计假设的问题是估计的一般问题中不可分割的一部分。