Only small amounts of wurtzite boron nitride and lonsdaleite exist naturally or have been made in the lab so until now no one had realised their superior strength.
天然存在
验室制造的纤锌矿型氮化硼和朗斯代尔石数量很少，直到现在，也没有一个
发现它们令吃惊的硬度。
Only small amounts of wurtzite boron nitride and lonsdaleite exist naturally or have been made in the lab so until now no one had realised their superior strength.
天然存在验室制造的纤锌矿型氮化硼和朗斯代尔石数量很少，直到现在，也没有一个发现它们令吃惊的硬度。
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