fatal radiation sickness 致死性放射病
A slow and steady trek that allows time for acclimatization is the safest way to ascend and prevent altitude sickness, which could have fatal consequences.
缓慢均匀的徒步才能给人适应环境的时间，这是在海拔上升过程中，避免会产生致命后果的高原病的最安全途径。
A: Sleeping sickness, also called "human African trypanosomiasis", is a widespread tropical disease that can be fatal if not treated.
答：昏睡病也称为“非洲人类锥虫病”，是一种传播广泛的热带病，如不给予治疗，则可能造成死亡。
Without treatment, sleeping sickness is considered fatal.
如不进行治疗，一般认为昏睡病是致命的。
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