Beryllia
氧化铍
🗣️ 情景例句
Yes, Sam?
什么事 ，Sam？
We'll start with an orientation video. It runs about 15 minutes.
我们将从一个电视简报开始，大概放15分钟。
I don't like autumn and winter.The days are short and the nights are long.The sun rises late and set early.
我不喜欢秋天和冬天，因为此时白天短而夜晚长，太阳升得迟而落得早。