这可以解释为什么有一些人是在大多数时间里是自然心情愉快的，而其他有一些人脸上带着那固有的怒视---这部分受他们由基因决定的易患病的体质。
This explains why some people are naturally cheerful most of the time, while others walk around with a permanent scowl on their faces ?
他说，目的不是为了让父母们担心，而是使人们认识到其遗传性易患病体质，并促使他们保持自己最佳的健康状态。
He says the goal is not to make parents worry, but rather to make people aware of their genetic predispositions and encourage them to stay on top of their health.
这也是可能的，他说，那些死去的人有一种潜在的遗传的易患病体质或状态。
It's also possible, he said, that those who died had an underlying genetic predisposition or condition.
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