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wavelength

n.
1.the distance (measured in the direction of propagation) between two points in the same phase in consecutive cycles of a wave
2.a shared orientation leading to mutual understanding

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    Idiom of the Day

    run (someone) out or run out (someone)
    to force someone to leave, to expel someone
    The police ran the drug dealers out of town.



    1.
    S1: Today the earth has many satellites besides the moon.
    S6: As a result, they travel in an orbit round the earth.

    P: But the pull of the earth keeps them from doing so.
    Q: The artificial satellites do not fall because they are going too fast to do so.
    R: They are artificial satellites made by man and very much smaller than the man.
    S: As they speed along, they tend to go.straight off into space.

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