U形弯
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u-shaped bent part
u型弯件
以上为机器翻译结果，长、整句建议使用 人工翻译 。
During rail laying, the loop part of the U-shaped bent loop is knocked bent to hold down the foot of the rail and in this way, the sleeper and the rail are connected together.
铺轨时，“U”形弯环的环部被砸弯，压住钢轨的底脚，即可将轨枕与钢轨联结在一起。
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