I use these terms in their most comprehensive sense,embracing all permanent instruments or helps to production,from a flint and steel for striking a light,to a steam ship,or the most complex apparatus of manufacturing machinery.

• 我是按最广泛的意义来使用工具这一术语的。从打火用的燧石和火镰，直到轮船，或最复杂的机器，生产所使用的全部耐用工具或辅助器具都包括在内。