Pentasulfide
五硫化物
🗣️ 情景例句
For a beginner, you're pretty good.
做为一个初学者，你已经做得很好了。
One party is entitled to cancel the contract if the other side cannot execute it.
如果一方不履行合同，另一方有权取消合同。
Let me give you an indication.
我可以提示一个想法。