Beryllocene
二茂铍
🗣️ 情景例句
There's a long way to go in reviving the countr's economy.
这个国家的经济复苏还有很长一段路要走。
She began playing the violin when she was nine.
她从九岁就开始练习小提琴。
How much more?
还要多下多少？