Hjelmite
钙钽钇矿(原译名钙铌钽矿)
🗣️ 情景例句
A crystal chandelier would look great in the living room.
在这间卧室里放一盏水晶吊灯会很漂亮的。
Didn't I see you in the play The Master Builder?
你没有出演《彪拉老师》的舞台剧吗？
and a period (which is the time it takes a wave crest to travel one wave length).
和周期（浪峰走过一个波长所需的时间）。