Fluocarbon
氟代烃
🗣️ 情景例句
His excuse sounds unconvincing.
他说的理由好像不可难。
Could you change my flight date from London to Tokyo?
请你更改一下从伦敦到东京的班机日期好吗？
Long ago, people believed that the world was flat.
很久以前人们相信地球是平的。