TRNGs are usually based on physical phenomena such as thermal noise, atmospheric noise, radioactive decay and even coin-tossing.
真随机数发生器的熵源通常来自于真实的物理世界，如热噪声，大气噪声，放射性衰减甚至掷硬币。
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If a losing male continues to be aggressive, the chances are he will be seriously injured (it is unlikely natural selection could have foreseen competitive coin-tossing).