Pentasulfide
五硫化物
🗣️ 情景例句
You are a very smart young man, Robbie.
你是个绝顶聪明的年轻人， Robbie。
What did he say in the letter?
他在信里说什么了？
A child ran into the street and knocked her off her bicycle.
一个孩子冲上马路，把她从车上撞了下来。