两面行动 ambivalent behavior 在相互矛盾的欲求之下，其同一行为过程可交互地引起不同的反应。例如，一种隆头鱼的雌鱼在接近雄鱼巢时，雄鱼先表现出攻击行为，随后则攻击与求爱行为交互出现。最后雌鱼产卵而制止了雄鱼的敌意。丝鱼的之字形舞也是攻击和引诱入巢的两面行为，而作为仪式化的结果表现出来。
形式与功能像一个硬币的两面，就好比思想与行动是思维的外壳一样。
Much like function and form are two sides of the same coin, thinking and tracking the results of that thinking are fundamentally related.
每个问题都有两面，如果你决定站在某一边并采取有效行动，那些支持另一边的人自然反对你的行动。
There are two sides to every question. If you take one side with decision and act on it with effect, those who take the other side will of course resent your actions.
你得假装你是100%确定，你得采取行动，你不能犹豫或两面下注，任何更少的决心将致使你的努力成为失败。
You have to pretend you're 100% sure. You have to take action; you can't hesitate or hedge your bets. Anything less will condemn your efforts to failure.
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