Plumboniobite
铅铌铁矿
🗣️ 情景例句
And it needs your contributions of furniture,
而且也需要你捐献家具，
I eat dinner at about 7 o'clock.
我在大约7点钟吃晚饭。
Sometimes the secrecy goes to such an extent that the whole nature of the research cannot be mentioned.
有时，保密竟达到了这样的程度，即连研究工作的整个性质都不准提及。