preflight

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Weather conditions can change quickly, making preflight briefings obsolete.
天气状况变幻莫测，使得飞行前的天气信息失去时效。
Most of them are obvious: mandatory training and medical evaluations for passengers and crew, full disclosure of all risk to passengers, and successful preflight testing.
其中大部分不言自明：针对乘客和机组的强制训练及医疗评估；须向乘客充分告知风险；预飞训练合格等。
One of the many important aspects of preflight training will be to make sure that passengers are fully prepared for weightlessness, indeed, perhaps not even too excited about it.
预飞培训中的几个关键点之一就是要确保乘客对失重有充分的准备，是的，就算太过兴奋也不合格。

Scott obtained this timer from Bulova during preflight training at the request of a friend.
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The pilot and co-pilot told authorities that he entered the cockpit while they were performing their preflight duties and checks and said he was a Boeing 747 pilot, officials said.
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Hiring people with the scientific training to regulate the preflight temperature and water purity and to control waste during transit is the only solution, say experts such as John Neo, who heads aquarium-gear supplier Ehaim Asia.
FORBES: Magazine Article