Cold shots develop from low casting temperature, and dirt spots result from pickup of sand or slag by molten metal.
较低的铸造温度会形成冷疤，熔化金属出现的沙粒或炉渣的累积会导致污点。
Cold shots develop from low casting temperature, and dirt spots result from pickup of sand or slag by molten metal.
较低的铸造温度会形成冷疤，熔化金属出现的沙粒或炉渣的累积会导致污点。
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