Heptasulfide
七硫化物
🗣️ 情景例句
Could I have the bill, please?
我能买单吗？
By the way,who are you waiting for?
顺便说,你正在等谁？
the young man has a glorious future before him and the old one has a splendid future behind him:
青年人有光辉灿烂的前景，而老年人的辉煌已成为过去。