在你的女儿参加聚会的时候，鼓励她用两人同行制，并做好其中一人喝醉的周密准备。
Encourage your daughter to use the buddy system when she goes to a party and have a plan if she or a friend drinks too much.
可以把这种对应看作是各负责另一人之安全的两人同行制，每一个自然数都与某个正分数配对，反之亦然。
You could think of this correspondence as a buddy system in which each natural number is paired with some positive fraction, and vice versa.
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