But if the progress of the world had been left to the serf and his feudal master, we would still be living after the fashion of the twelfth century, saying "abracadabra" when we tried to stop a tooth-ache, and feeling a deep contempt and hatred for the dentist who offered to help us with his "science", which most likely was of Mohammedan or heathenish origin and therefore both wicked and useless.
n. 管道装置,铅管工行业 动词plumb的现在分词