Plumbocolumbite
铅铌铁矿
🗣️ 情景例句
so that we can record our thoughts about the trip.
以便我们能录下旅行中的感想。
What we are ignorant of is immense.
我们不知道的东西多得不可胜数。
The old lady was glad to be back at the block of flats where she lived.
老妇人回到了她居住的公寓楼，心里很高兴。