He talks about a ship's voyage and this is one of the most famous bits of the essay—how the best voyage is made up of zigzag lines.
他讲到了关于船航行的例子，这是文中最著名的部分之一——最成功的航行是如何由曲折的航线组成的。
The zigzag lines didn't emerge until 20, 000 years ago and by 13, 000 years ago had disappeared.
锯齿形线条是在20 000年前以后才出现的，可是到了13 000年前左右，这些线条就不再产生了。
The zigzag lines didn't emerge until 20, 000 years ago and by 13, 000 years ago had disappeared.
锯齿形线条是在20 000年前以后才出现的，可是到了13 000年前左右，这些线条就不再产生了。
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