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Today, I finally learned to slip roller skates, I am very happy, I finally learned to.
今天，我终于学会溜旱冰鞋了，我很快乐，我终于学会了。
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This paper discusses the mechanisms of roller bearing slip and skidding damage, and describes different kinds of measures on skid prevention.
本文讨论了打滑及蹭伤的机理，阐述了不同类型的防滑措施。
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模块上移
模块下移
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