Petscheckite
铌钽铁铀矿
🗣️ 情景例句
There are many natural catastroophes occurring in nature.
自然界里有很多自然灾害发生。
He is a manager of a famous corporation.
他是一家着名公司的经理。
Speculations about is nature have been going on for literally thousands of years,
人们对睡眠作用的种种猜测，确实有数千年之久。