There remained the generic conditions imposed by natural, as distinct from human law, as integral parts of the human whole: the necessity of destruction to procure alimentary sustenance: the painful character of the ultimate functions of separate existence, the agonies of birth and death: the monotonous menstruation of simian and (particularly) human females extending from the age of puberty to the menopause: inevitable accidents at sea, in mines and factories: certain very painful…
There are no more uses of "sustenance" in the book.
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The soup kitchen was her only sustenance.
As they grew more affluent, gardeners planted more for beauty than for sustenance.