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.

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，直到现在，也没有一个人发现们令人吃惊的硬度。

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，直到现，也没有一个人发现们令人吃惊的硬度。

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，直到现，也没有一个人发现们令人吃惊的硬度。

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.

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，直到现在，也没有一个人发现们令人吃惊的硬度。

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型氮化硼和朗斯代尔石数量很少，直到现在，也没有一个人发现们令人吃惊的硬度。

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纤锌矿型氮化硼和朗斯代尔石数量很少，直到现在，也没有人发现们令人硬度。

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，直到现在，也有个人发现们令人吃度。

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，在，也没有一个人发们令人吃惊的硬度。

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，直到现，也没有一个人发现们令人吃惊的硬度。