大脑发现最好使嗅觉感受器(19)用于保持对不熟悉和紧急事件信号的敏感，(20)比如烟的气味，这可能表明了火灾的危险。

The brain finds it best to keep smell receptors 19 for unfamiliar and emergency signals 20 the smell of smoke, which might indicate the danger of fire.

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同时大脑发现它最好使感知器对一些非寻常的或紧急的信号保持运作，如可能造成火灾的烟的气味。

The brain finds it best to keep smell recepters available for unfamiliar and emergency signals such as the smell of smoke, which might indicate the danger of fire.

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大脑发现最好能让气味感受器对不熟悉或是紧急的信号保持敏感，例如烟的气味，其暗示可能有火灾的危险。

The brain finds it best to keep smell receptors available for unfamiliar and emergency signals such as the smell of smoke, which might indicate the danger of fire.

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