Ousbeckite
水钒铜矿
🗣️ 情景例句
Now, let me explain one point to you.
现在，让我就这一点进行说明。
Mr. Smith is still in his forties.
史密斯先生才四十几岁。
Before you leave the lab, make sure the electricity is turned off and the windows are shut.
你们离开实验室前，务必要关上电源，关好窗户。