- patent monoply
- n.专利垄断
English-Chinese dictionary of mining (英汉矿业大词典). 2013.
English-Chinese dictionary of mining (英汉矿业大词典). 2013.
Envelope manufacture — Envelope production, whether by hand or by machine, involves the manufacture of envelopes to carry mail. Nearly all of the estimated 450 billion envelopes made each year worldwide are machine made.History of envelopesPrior to 1845, hand made… … Wikipedia
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