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.
天然存在或者实验室制造的纤锌矿型氮化硼和朗斯代尔石数量很少，直到
在，也没有一
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.
天然存在或者实验室制造的纤锌矿型氮化硼和朗斯代尔石数量很少，直到在，也没有一吃惊的硬度。
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