The electron free flying time is determined by the electron -neutral particle collision frequency.

电子的自由飞行步长由电子与中性粒子的碰撞频率来决定。

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We decided to stay for a week, leaving home for the first time made me so happy, I was like a bird, flying in the sky, breathing the free air.

我们决定停留一周，第一次离开家让我很开心，我就像一只鸟儿，在天空中飞翔，呼吸着自由的空气。

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Ilike flying kites in my free time.

我喜欢在空闲时间放风筝。

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Once he got his flying license, he seemed a liberated man, free to travel as he wished without superfluous demands on time and energy.

CNN: Brought up to be a good man