It is also possible to trace back from lower to higher levels of abstractions.
从低层级到高层级的抽象也是可能的。
Through reading, I can trace back to ancient Egypt, the cradle of human civilization.
通过读书，我可以追溯到占代埃及——这个人类文明的摇篮。
This is really a sad story. Did they trace back your luggage?
情况真是糟糕。他们找回你的行李了吗？
The first part is: Trace back to the source — different description in history.
第一部分：溯源——不同的历史描述。
The first part is: Trace back to the source — different description in history.
第一部分：溯源——不同的历史描述。
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