钻石是稀有火成岩（称为煌斑岩和金伯利岩）中偶尔出现的一种成分，其年代测定方法从未令人满意。
Diamonds, an occasional component of rare igneous rocks called lamproites and kimberlites, have never been dated satisfactorily.
研究人员最近发现了金伯利岩矿床，这暗示着钻石的存在。
Researchers recently found kimberlite deposits hinting at the existence of diamonds.
在南非这个以钻石矿而闻名的国家，金伯利岩衬托出了这颗黄钻的美丽。
The igneous rock kimberlite sets off a yellow diamond from South Africa, a country known for its diamond mines.
应用推荐