Strict rule to follow: Never give away your phone number or address. Even the email address should remain hidden at least until the first meeting.

必须遵守的原则：坚决不泄漏你的手机号码或是地址。甚至连电子邮件的地址也至少在第一次会面之后再给出去。

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The rule to be tested is: “If a card shows an even number on one side, then it is red on the other.

游戏的规则是：“如果某张卡片上的数字是偶数，那么另外一边便是红色。”

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The rule to be tested is: “If a card shows an even number on one side, then it is red on the other.”

游戏检验的规则是：“如果一张卡片展示的是偶数，那么另一张卡片就显示红色。”

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Rule number one for the perfect day in Boston: do not even think about driving a car around here.

BBC: A perfect day in Boston