Grind principle of whirl plank-grinding machinery and constitution as well as action of parts has keen narrated.

叙述了旋转砂光机的工作原理和结构组成以及各组成分的作用。

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Wenzhou Zhiyong Grinding Machinery Factory is a professional enterprise specializing in producing two-side grinder...

温州市瓯海郭溪志勇研磨机械厂是专业生产双面研磨机和抛光机器的企业。

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Wenzhou Zhiyong Grinding Machinery Factory is a professional enterprise specializing in producing two-side grinder and polishing machine.

温州市瓯海郭溪志勇研磨机械厂是专业生产双面研磨机和抛光机器的企业。

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But even with blasting and machinery grinding through the rock day and night, most New Yorkers are blithely unaware of the construction or the eerie underworld that includes a massive, eight-story cavern, miles of tunnels and watery, gravel-filled pits.

NPR: New York Expanding Nation's Biggest Transit Hub