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蚕茧是由昆虫制造的一种由丝组成的外包层。
A cocoon is a kind of silk covering made by an insect.
youdao
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对于阶跃折射率双包层光纤,甚至还得到了一个简单的解析公式。
As to step index DCF, we even obtain a simple analytic formula.
youdao
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对于阶跃折射率双包层光纤,甚至还得到了一个简单的解析公式。
As to step index DCF, we even obtain a simple analytic formula.
youdao