By the extension, besides, of cultivation, the unimproved wilds become insufficient to supply the demand for butcher's meat.

此外，随着耕作的扩大，未改良的荒野变得不足以满足对屠宰肉的需求。

It is the sober and industrious poor who generally bring up the most numerous families, and who principally supply the demand for useful labour.

养育最多家庭的通常是清醒和勤劳的穷人， 他们主要提供有用劳动力的需求。