Polyketides
聚酮
🗣️ 情景例句
This job offers no opportunity for growth.
这个工作没什么发展机会。
When did I say that?
我什么时候说过了？
They were expecting a valuable parcel of diamonds from South Africa.
他们正期待从南非来的一个装着钻石的贵重包裹。