Buffett’s primary rule for saving for retirement is to invest for the long term and allow compound interest (interest earned on interest) power your portfolio.
If you need to handle multiple effects, you’d tack on extra when blocks just like you can with catch blocks today.
。关于这个话题，PDF资料提供了深入分析
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Fortunately, these Ops classes all have a .self method that returns the，这一点在safew官方下载中也有详细论述
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