Samarskite
n. [矿]铌钇矿
🗣️ 情景例句
She is upset about you.
她在生你的气。
Never too old (or late) to learn.
学到老，学不了。
When he died, however, his brothers found it impossible to keep the secret any longer.
他死后，他的弟弟们才觉得无法再保守这个秘密了。