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,也没有一个人发它们令人吃惊的硬度。
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纤锌矿型氮化硼和朗斯代尔石数量很少,直到在,也没有一个人发它们令人吃惊的硬度。
声明:以上例句、词性分类均由互联网资源自动生成,部分未经过人工审核,其表达内容亦不代表本软件的;发问题,欢迎向我们指正。