The concept of legal obligation is central to the understanding of law.
我们发现了所盼望发现的东西，并且我们接受了所请求的东西。
An invention can be so valuable as to be worthless to the inventor.
Quality is not a theory; it is a practice.
我们能留下的最好遗产是一个生生不息的遗产。
The truth is rarely pure and never simple.
医疗技术的创新需要对科学原理和患者实际需求的深刻理解。