Base on BP Neural Network, this research has built a flight Phase safety Risk Assessment model.

本文基于BP神经网络，建立了民用航空航段安全风险评估模型。

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So, the action of extending the leg backward creates a forward and upward movement (the flight phase).

因此，腿向后伸展的作用力，产生一个向前向上的运动(腾空阶段)。

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The flight phase: As an athlete moves through the air, his leg swings backward and then moves rapidly forward.

腾空阶段：当运动员在空中移动之时，他的腿先向后摆动，然后迅速向前移动。

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The five-segment booster is intended to power the early flight phase of Nasa's proposed Ares 1 launch vehicle - its replacement for the space shuttle.

BBC: Test ignition for 'Moon rocket'

As a pilot for Alaska Airlines I can tell you that we are working to get approval to use the iPAD for every phase of flight.

FORBES: Connecting marketers to the Forbes audience. What is this?

And then something that they would call the boost-phase missile defense, which would be ways of shooting down missiles when they're at their sort of most vulnerable phase of flight.

NPR: Missile Defense, the U.S. and Europe