Naumannite
硒银矿
🗣️ 情景例句
you have a lunch appointment with Mr. Levine,
跟Levine先生约好吃午餐。
In fact she's 20 years old.
她只有二十岁。
I can't remember. Did I put them under the table?
我想不起来了。 放在桌子下面了吗？