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。
The pulling chain uses die-forging chain plate, which has high strength and long service life.
牵引链采用模锻成型链板，强度高、。寿命长。
The pulling chain uses die-forging chain plate, which has high strength and long service life.
牵引链采用模锻成型链板，强度高、。寿命长。
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