If it is high-altitude operations, the device must wear safe installation time. Do anti-corrosion treatment and drainage disposal, can not show the status of leakage.

假如是高空作业，那装置的时分一定需求戴平安安装。做好防腐处置和排水处置，不能呈现漏水的状况。

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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.

CNN: Pilot training blamed for Bali airliner crash