Polysulfide
[化] 多硫化物\\n[医] 多硫化物
🗣️ 情景例句
The Post Office aims to improve its quality of service.
邮局锐意改善服务质量。
I'm going to try to leave by 10:00.
我争取10点以前离开。
CUSTOMS OFFICER: Are these your cases?
这些是你们的箱子吗？