Pek
[化] 聚醚酮
🗣️ 情景例句
Where are you working now?
你现在在哪里工作？
In my opinion, the product must be priced under $ 300.
就我的意见来说，产品价格必须订在300美元以下。
What did you eat yesterday?
你昨天吃了什么呢？