收到约定的信号后，他们离开了房间。
我与父亲约定的信号是，假如他已经是继承人，我就在桌子下踢踢父亲的腿，那么他不会求婚——否则，他就会当晚求婚。
The signal agreed on between my father and me was that if he was her heir without being her husband I was to kick him under the table and he would not propose - otherwise he would.
第一种方法是为孩子们设计一个预先约定的动作信号，当他们吵得太凶或者开始打起来的时候用作回应。
The first was to come up with a pre-agreed physical signal for Cara's children to react to when they got too noisy and started fighting.
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