求翻译：Aluminothermic welding is a process in which an aluminothermic reaction takes place within a crucible and the resultant molten metal flows into a weld joint contained by a mould. The by-product, aluminium oxide slag, is contained in a side receptacle. Aluminothermic welding process is characterized by simple equipment, low cost, and easy operation, so it is widely used in continuous rail weld throughout the world.是什么意思？

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