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It requires a positive, a core made of refractory material and an outer layer of wax.
用耐火材料做成实心的正像, 外面覆以蜡层.
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Unbreakable PC Container, users could benefit from more cost-effective and guarantee quality.
耐用的PC容器也是质量和效率的保证.
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Robust body with raised seating surfaces ground to mirror-like finish.
坚固耐用的阀体,配置具有研磨镜面光洁度的凸面阀座表面.
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I would recommend starting with something durable , strong and that turns well.
我推荐开始用一些耐用的, 高强度的并且转的灵活.
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