... piston underside活塞下侧 flat underside平底板 underside welding仰焊 ...
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When pouring molten glass onto the molten tin, the underside of the glass would also be perfectly flat.
当把玻璃液倒在锡液上时，玻璃的底面也会变得完全平整。
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Equipped with a flat underside and cupped upper shell that resembles a skewed dome, they are etched with faint concentric lines that recall growth spurts.
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