澳大利亚海域有鲨鱼出没斯很平常的，但是鲨鱼攻击人类却很少见，不过致命的鲨鱼攻击却是周期性发生的。
Sharks are common in the waters around Australia. Attacks on humans are normally rare, but fatal attacks periodically occur.
在他的报告中，Bahna讨论了一个30岁的伴花生过敏的男性医生，他患有周期性的过敏，一种致命性的过敏反应。
In his presentation, Dr. Bahna discussed a 30-year-old male doctor with a peanut allergy who has had recurrent anaphylaxis, a life-threatening allergic reaction.
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