Old readers know that I am a stock investor. Recently, when I was looking at the stock software statement, I found that some fees were too high. Finally, after handling it in the way of a human society, the rate dropped by an order of magnitude. I think it may be useful to some readers.

In the process of using the old Macbook pro recently, I feel that whether it is CPU, memory or disk space, I am running out of money, and I gradually came up with the idea of building a computer by myself.

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