本文着重研究了以天然贝壳、氢氧化钙和EDTA为原料来制备该产品的生产流程和工艺条件。
The producing process and condition preparing - EDTA calcium disodium salt by the application of shell, calcium hydroxide and EDTA are studied emphatically at the same time.
但是当时的它们是由天然材料制成的——椰子，贝壳，镂空的石头或相似的物体，里面装满苔藓，地衣或同样能吸收动物脂肪且容易点燃的材料。
Back then they were made of naturally occurring objects - coconuts, sea shells, hollow stones or similar objects filled with moss or a similar material that was soaked with animal fat and ignited.
我们凭着传统的手工雕刻技艺，先进的机械设备和高新技术，把天然的贝壳加工成精美的工艺品。
We carved with the traditional manual techniques, advanced equipment and high-tech, natural shells processed into exquisite handicrafts.
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