Polyyne
聚炔烃
🗣️ 情景例句
You can feel very proud of your grandson, Mr. Stewart.
你可以为你的孙子感到非常的骄傲， Sewart先生。
I enjoyed it very much.
我非常喜欢。
Young people love this time of year, because it is good for sports.
年轻人喜爱这个时节，因为它适合体育运动。