Propylidene
亚丙基
🗣️ 情景例句
I did my thesis on Sino-American Business Relationship.
我做的论文题目是中美贸易关系。
You're big and fat, and I'm little and skinny.
你虽然大而胖，但我却小而瘦。
John asked Grace to marry him，
约翰向格雷斯求婚。