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Richard: So they are like B - grade movies?
理查德: 这么说它们像是B级片?
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Some B - grade movies are very good, but most of them are not worth watching.
有些B级片很不错, 不过大多数片子不值得去看.
A - and B grade hex bolts mainly used in the smooth surface of high precision machinery, equipment.
A 级 和B级的六角螺栓重要采用在表层光洁,对精度要求高的机器, 设施上.
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