留个记号，很经典的书

It's exactly the same as before, not worth the money!

In my defense, probably you mixed it up. this version is way better than the other version.
the differences:
1. the previous one is only 4megabyte, this one is 7M.
2, you can use the search function in this file, which will be super helpful for reference, but you can not search in the other one.
3. the quality is better than the other.

确实质量还可以.

感谢分享！