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很少，直到
在，
有一个人发它们令人
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纤锌矿型氮化硼和朗斯代尔石数量很少，直到在，有一个人发它们令人硬度。
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问题，欢迎向我们指正。
