我通常只要保证他们收到信件即可，并不需要他们做出任何确认。
I don't usually ask for any acknowledgement other than to make sure they received the letter.
递归是一门伟大的艺术，使得程序的正确性更容易确认，而不需要牺牲性能，但这需要程序员以一种新的眼光来研究程序设计。
Recursion is a great art, enabling programs for which it is easy to verify correctness without sacrificing performance, but it requires the programmer to look at programming in a new light.
我们还发现你的朋友默认可以不需要你确切允许或确认的情况下帮你签到。
We've also noted that your friends can, by default, check you in without your explicit approval or permission.
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