Plumboniobite
铅铌铁矿
🗣️ 情景例句
I want you to be my lifelong partner.
我想和你永远在一起。
Please excuse me for a little while.I want to do something.
请等我一会儿时间，我要做点事。
a wave length (the horizontal distance between two wave crests),
波长（两个浪峰间的水平距离）