Yttrogummite
钇铅铀矿
🗣️ 情景例句
I did my thesis on Sino-American Business Relationship.
我做的论文题目是中美贸易关系。
How many pieces are you going to buy?
你要买几个？
You can't buy them in the shop before eight o'clock.
上午八点之前你在商店里是买不到东西的。