... three major fertilizer 三要素肥料 three molter 三眠蚕 three phases of soil 土壤三相 ...
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And then the trimolter variety Qianchun×Zhiri was selected with stable moltinism,healthy body,fine filament size and high quality cocoon and silk.
通过杂交选配,育成了强健好养、眠性稳定、茧丝纤度细、茧丝质优的三眠蚕品种"芊春×知日"。
参考来源 - 家蚕细纤度三眠蚕品种“芊春×知日”的选育研究·2,447,543篇论文数据，部分数据来源于NoteExpress
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