可以使机械龙顺畅运作的核心零件。 需精密加工，仅有工匠能操作，是珍贵材料，也是复杂机械结构的心脏。
A core component designed to let the Mechadragon move smoothly. It requires precise machining and demands skills only master craftsmen can handle. As a valuable material, it serves as the heart of a complex mechanical structure.