The reality is that these "contracts" never produce the desired result; they simply define the battlefield on which opponents will square off as soon asthingsgo wrong.
实际情况是这些合同从来不会产生有意义的结果；他们只是在一旦出现问题时定义一个同对手作战的战场。
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Whether it's rough physical play, outdoor play or social or pretend play, kids derive important lessons from the chance to make things up as they go, he said.