Polyketone
聚酮
🗣️ 情景例句
Yeah. Quite a bit different.
是啊， 相当不一样。
But wouldn't you like to spend an extra day or two here?
你们不愿意在北京多待一天吗？
Are you free later today, Mr. Green?
您今天晚些时候有空吗，格林先生？