Conduct a thorough preflight briefing among all flight participants.

向所有飞行旅客进行飞行前简令。

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A flight starts with briefing on main devices, buttons, levers, flight principles and philosophy.

飞机带有主要设备、按钮、控制杆的简介，飞行原理与哲学。

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Such a briefing is done routinely, even when two qualified pilots are involved in the flight.

即使是2名有资格的飞行员要飞行，也要对他们进行这种简短的例行介绍。

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How many times have you heard the flight safety briefing?

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China's Foreign Ministry spokesman Hong Lei, however, said during a regular news briefing that the plane's flight was "completely normal".

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