原因之一从亚当·斯密著名的针厂故事中可见一斑，他发现针厂如此高效的原因是专业化分工。
One reason is found in Adam Smith's famous story of the pin factory. Smith observed that the pin factory was so productive because it allowed workers to specialize.
结果表明：在PDA培养基中，加入10％的密环曹代谢滤液，对玉米大斑和小斑病生长的抑制作用达到82％-85％。
The results indicated that 10 % metabolic liquid of Armillaria mellea in PDA medium can inhibit the growth of Exscrohilum turcicum and Bipolaris maydis by 82 % - 85 %.
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