Objective To seek the safe and effective method of expelling coccidian of altitude pika.

目的探求一种安全高效的驱治高原鼠兔球虫的方法。

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Objective: to probe into the safe time limit of high concentration oxygen therapy in rabbits with hemorrhagic shock in high altitude.

探讨高浓度氧疗对高原失血性休克家兔作用的安全时限。

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The altitude at which the co-pilot handed control of the plane to his colleague was below the minimum altitude considered safe to continue final descent.

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The Himalayan Rescue Association, a non-profit health organization that offers safety seminars to trekkers in Manang, warns that ascending more than 300 or 400 metres higher than the previous day's sleeping altitude is not safe, especially when you are above 3, 000 metres.

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The TSA says the scanners are safe, exposing people to about the same amount of radiation they would get by flying for about two minutes at altitude.

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