The same person blows the bellows, stirs or mends the fire as there is occasion, heats the iron, and forges every part of the nail: in forging the head, too, he is obliged to change his tools.

同一个人吹风箱、搅动或补火（视情况而定）、加热铁并锻造钉子的每一部分：在锻造头部时，他也不得不更换工具。