YOU SAID:

For since these arms of mine had seven years' pith,

INTO JAPANESE

私のこの腕には七年分の髄があり、

BACK INTO ENGLISH

This arm of mine has seven years' worth of marrow,

INTO JAPANESE

私のこの腕には7年分の骨髄があり、

BACK INTO ENGLISH

This arm of mine has seven years' worth of bone marrow,

INTO JAPANESE

私のこの腕には7年分の骨髄があり、

BACK INTO ENGLISH

This arm of mine has seven years' worth of bone marrow,