As to the economic characteristics, they had the features of big cocoon, high percentage of cocoon shell, long silk length, easy seperating of cocoon, good purity and superior quality.
在经济性状上具有茧型大，茧层率高，茧丝长，解舒易，净度好，丝质优的特点。
The outer part of the envelope now has the form of a thick shell or dust cocoon.
现在包壳的外层部分是厚壳层或尘埃包层的形状。
The outer part of the envelope now has the form of a thick shell or dust cocoon.
现在包壳的外层部分是厚壳层或尘埃包层的形状。
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