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Using of pre-drawing, extruding holes and shot peening techniques has shown obvious effect in extending the fatigue life of motorcycle chain.
用预拉、挤孔、喷丸等强化工艺来提高摩托车链条的疲劳寿命效果很明显；
youdao
In this lighting, I took this close shot of a rusty chain on a fence.
在这种光线下，我为一条篱笆上的锈铁链拍下这张特写。
When he reached the end of the chain, it jerked and he dropped as if shot.
NEWYORKER: Puppy
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