Janthinite
水铀矿
🗣️ 情景例句
Come on. you can do it!
来吧，你能行！
I doubt that I'll do anything tomorrow.
我不确定我明天将做什么事。
The further off this solid obstruction, the longer time will elapse for the return of the echo.
固体障碍物越远。回声返回所用时间就越长。