to the backbone
 徹頭徹尾,道道地地,純粹


 Back·bone n.
 1. The column of bones in the back which sustains and gives firmness to the frame; the spine; the vertebral or spinal column.
 2. Anything like , or serving the purpose of, a backbone.
    The lofty mountains on the north side compose the granitic axis, or backbone of the country.   --Darwin.
    We have now come to the backbone of our subject.   --Earle.
 3. Firmness; moral principle; steadfastness.
    Shelley's thought never had any backbone.   --Shairp.
 To the backbone, through and through; thoroughly; entirely.  “Staunch to the backbone.”

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