When the gas is cooled, any hazardous elements in the waste end up sealed in a glassy slag that is safe to put into landfill.是什么意思_When the gas is cooled, any hazardous elements in the waste end up sealed in a glassy slag that is safe to put into landfill.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句