Polysulfuration
聚硫化作用
🗣️ 情景例句
You can watch the web-cast of this program if you have broadband access to the internet.
如果你能用宽带上网的话，你能在网上收看到这个节目。
How often did I tell you to take your time?
我告诉你多少次要慢慢来?
Excuse me! Is this your bike?
打扰一下。这是你的自行车吗？