三生皆缘
They learn about the past chiefly from textbooks but also through such activities as field trips to historical sites and visits to museums.
他们主要是学习课本，有时也到历史古迹实地踏访并参观博物馆。
If we want to know about a person, we should find out his way of doing things. To learn about the past life of a great master in music, perhaps we should start from his works.
我们想要了解一个人，通常是通过他做事的方法，而想了解一位已故的.音乐大师，不妨从他的作品着手。
The more scientists learn about how it played out in disasters of the past, the more they can help us minimize loss in the future.
科学家们对它在过去灾难中的表现了解的越多，越能帮助我们减少未来的损失。
Simply learn to live in the present, rather than thinking so much about the future or the past.
学习活在当下，不要为未来和过去想得太多。
