转身数的总和必须是零，这是为了避免陷入某些环路，比如大写字母 G 形状的环路（在纸上试着走一下这个形状，就会明白我的意思）。
The requirement that your turns sum to zero is necessary to keep you from getting caught in certain loops, such as one shaped like a capital G (try it out on paper to see what I mean).
做那些能让你成功，或者让他人成功的事情。这不是一个总和为零的算术题。
Do things that allow you to win and that allow someone else to win. It is not a zero-sum game.
在很多情形下，商品的折后价加上运输费用的总和与零售价和消费者前往商场购买该商品所需的精力和时间的总和相当。
In many cases the discounted cost of the item combined with the shipping is reasonable compared to the full retail price plus the time and energy a shopper expends to go and get the item.
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