translation.en: The lesson here is that some high-performance tasks are easier than others, and that understanding the physics of the problem tells you which ones are easy and which ones are hard.
translation.zh: 这里的教训是一些高性能作业 比其它作业更容易。 而理解这个问题背后的物理学， 你就会知道哪些容易，哪些困难