But the lost wax casting technique is difficult to master.

但这种脱蜡铸造工艺法并非容易掌握.

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Lost - wax casting : Traditional method of producing molds for metal sculpture and other castings.

脱蜡 法: 制作金属雕塑和其它铸件用的模具的传统方法.

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Copper approach gradually enriched the emergence of lost wax casting, resin sand casting, foundry casting.

铜铸方法逐渐丰富,出现了失蜡法铸造, 树脂砂铸造, 翻砂铸造.

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