单词：hybrid seed of silkworm
单词：hybrid seed of silkworm 相关文章
Fifteen hundred years ago in China, silk production was a state secret. The silk trade was so valuable that anyone who tried to take silkworm eggs or mulberry seeds out of China was put to death. Then in 552 AD, two monks smuggled silkworm eggs to Co
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Survival Of The Sluggish Silkworms have been bred over thousands of years to behave quite unlike their caterpillar cousins in the wild. Thats because people purposely breed silkworms to fit this job description: WANTEDSuperlative silk producers. Bene
英语听力文摘 English Digest
Secrets Of Silk Production Fifteen hundred years ago in China, silk production was a state secret. The silk trade was so valuable that anyone who tried to take silkworm eggs or mulberry seeds out of China was put to death. Then in 552 AD, two monks s
英语听力文摘 English Digest
AGRICULTURE REPORT - Hybrids By Broadcast: Tuesday, June 08, 2004 This is Steve Ember with the VOA Special English Agriculture Report. Since ancient times, farmers have chosen the seeds for the coming
农业与发展
AGRICULTURE REPORT - Non-Profit Group Helps Farmers and Gardners Exchange Seeds By Staff Broadcast: Tuesday, September 06, 2005 I'm Faith Lapidus with the VOA Special English Agriculture Report. In ni
农业与发展
Silkworm s and Skin Graft s Don: One of the neater things thats going on in biology is the genetic modification of species. By changing the instructions in their genes, we can make certain plants and animals produce things that are useful to humans.
英语听力文摘 English Digest