... board with groove 槽板 brick with groove 带槽砖 bearing with oil groove 带油槽的轴承 ...
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外球面球轴承外圈一般带油槽，也生产外圈无油槽的产品。
Usually, the outer ring of the tl bearings has grease groove, bearings having no grease groove are to be provided, too.
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