Polyketone
聚酮
🗣️ 情景例句
Now, come on, son. Come on, son.
醒醒， 孩子。醒醒， 孩子。
I'm glad you came.
我很高兴你能来。
It is only 380,000 kilometres away, and it has been visited by man already.
已经有人到过月球旅行了。