The First Calendar 第一个日历

课前问题

What is the importance of the dots, lines, and symbols engraved on stone, bones and ivory?

刻在石头、骨头和象牙上的点、线和符号有什么重要性？

课文首句

Future historians will be in a unique position when they come to record the history of our own times.

未来的历史学家在记录我们这个时代的历史时将处于独特的地位。