……其他几种知名方法（我忘了具体哪种了）做过调整，好让心算变得更轻松。补记：这在马丁·加德纳的文集《Mathematical Carnival》第7章“心算快手的诀窍”（Tricks of Lightning Calculators）里有介绍。
…other well known methods (I forget which one) adjusted to make mental calculation easier. Addendum: this is described in chapter 7, "Tricks of Lightning Calculators" from the Martin Gardner collection "Mathematical Carnival".
…saver back in the day from instructions provided in a Scientific American article, which if memory serves was written by Martin Gardner. A casual search leads me to believe the article is in his book Mathematical Carnival, though I could be wrong. https://www.amazon.com/Mathematical-Carnival-Martin-Gardner/... While you program it up, you can play this little Hypercube game. Do it in 3D, then turn on the 4D to get an…
……其他几种知名方法（我忘了具体哪种了）做过调整，好让心算变得更轻松。补记：这在马丁·加德纳的文集《Mathematical Carnival》第7章“心算快手的诀窍”（Tricks of Lightning Calculators）里有介绍。
…other well known methods (I forget which one) adjusted to make mental calculation easier. Addendum: this is described in chapter 7, "Tricks of Lightning Calculators" from the Martin Gardner collection "Mathematical Carnival".
……当年根据《科学美国人》（Scientific American）上一篇文章的指引搞出来的屏幕保护程序（saver），如果我没记错的话，作者是马丁·加德纳。随便搜了一下，我觉得那篇文章应该收录在他的书《Mathematical Carnival》里，不过我也可能记错。https://www.amazon.com/Mathematical-Carnival-Martin-Gardner/... 在你写代码搞这个的空当，可以玩玩这个超正方体（Hypercube）小游戏。先玩3D模式，然后打开4D来体验……
…saver back in the day from instructions provided in a Scientific American article, which if memory serves was written by Martin Gardner. A casual search leads me to believe the article is in his book Mathematical Carnival, though I could be wrong. https://www.amazon.com/Mathematical-Carnival-Martin-Gardner/... While you program it up, you can play this little Hypercube game. Do it in 3D, then turn on the 4D to get an…