industrial l stones 工业金刚石
Diamonds are useful as an industrial material as well as gem stones, and they would have many more applications if they could be made cheaply.
这是一个重要的问题。和宝石一样,作为工业原料的钻石很有用,而且如果他们价格便宜一些的话会有更多的用处。
Diamonds are useful as an industrial material as well as gem stones, and they would have many more applications if they could be made cheaply.
和宝石一样,作为工业原料的钻石很有用,而且如果他们价格便宜一些的话会有更多的用处。
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