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mach number

n.
1.the ratio of the speed of a moving body to the speed of sound

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  • machaeranthera bigelovii
  • machaeranthera tanacetifolia
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  • Idiom of the Day

    butt in (on someone or something)
    to interrupt someone or something
    I do not like that woman because she always butts in on our conversation while we are talking.



    1.
    I've ___ half the book and will try to finish it at the weekend.

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    Invention
    Invention : ink
    Year : c. 2500 bc
    Inventor : -
    Country : egypt, china.      .. More >>
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