Certainly those who fatten pigs or prepare pills are productive, but the instructors of youths and of adults, virtuosos, musicians,physicians, judges, and administrators, are productive in a much higher degree.

• 那些养猪的和制丸药的当然属于生产者，但是青少年和成年人的教师、作曲家、音乐家、医师、法官和行政官也是生产者，他们的生产性比前一类要高得多。