But not silk, which has high strength despite being built from inherently weak building blocks.
但是天然丝不会这样，尽管它是由原本比较脆弱的结构单元构成的，但是却拥有高强度。
Some high quality ones are even covered with thin silk.
一些高质量的甚至是覆盖着薄丝。
The current reel silk drying device results in low heat efficiency but high heat loss.
缫丝厂现行小烘丝装置热效率低，热量损耗大。
The current reel silk drying device results in low heat efficiency but high heat loss.
缫丝厂现行小烘丝装置热效率低，热量损耗大。
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