What if that same process could be run in reverse, like a movie run backward?
如果相同的过程逆向运行会怎样，像一部倒放的电影？
The tape could not run backward.
而纸带不能倒过来运行。
And now since it's reversible, we can run it forward or backward.
因为它是可逆的，所以可以正方向运行。
And now since it's reversible, we can run it forward or backward.
因为它是可逆的，所以可以正方向运行。
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