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
纤锌矿型氮化硼和朗斯代尔石数量
，
到现在，也没有一个
发现它们令吃惊
。
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纤锌矿型氮化硼和朗斯代尔石数量，到现在，也没有一个发现它们令吃惊。
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