解释：先前所使用的，现在或许要抛弃。现在要抛弃的，将来或许会用到。

海洋的健康直接影响地球和人类的健康。

The state is the people organized for law.

How far you go in life depends on your being tender with the young, compassionate with the aged, sympathetic with the striving and tolerant of the weak and strong. Because someday in your life you will have been all of these.

The most important part of teaching is to teach what it is to know.

Justice is not a destination, it's a journey.

在观察性研究中，我们常常不得不依赖于无法直接检验的假设。