stepped hole 级形孔
Multi-stepped Hole and Operations Form 多台阶孔和操作表
Inverse Stepped Hole 反阶梯孔
ring with stepped hole 阶梯孔环件
hole stepped
洞了
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Returning to the grass track of his youth, he stepped in a hole and injured his hip, though it has recovered.
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